Sample of how to start building an RPG, with rooms that have different (and common) actions you can perform in them.

Bedroom.cs

namespace BusinessObjects.RedditZorkQuestion
{
    public class Bedroom : Room, ICanSleepHere
    {
        public Bedroom(string name) : base(name)
        {
        }

        public void Sleep(Character character)
        {
            character.Heal(3);
        }
    }
}

Character.cs

using System;

namespace BusinessObjects.RedditZorkQuestion
{
    public class Character
    {
        public string Name { get; set; }
        public int MaximumHitPoints { get; set; } // When fully healed
        public int CurrentHitPoints { get; set; }
        public Room CurrentRoom { get; set; }

        public Character(string name, int hitPoints, int currentHitPoints)
        {
            Name = name;
            MaximumHitPoints = hitPoints;
            CurrentHitPoints = currentHitPoints;
        }

        public void Heal(int numberOfHitPointsToHeal)
        {
            // Heal the character of 'numberOfHitPointsToHeal' hit points, but don't exceed their maximum hit points.
            CurrentHitPoints = Math.Min(CurrentHitPoints + numberOfHitPointsToHeal, MaximumHitPoints);
        }
    }
}

ICanEatHere.cs

namespace BusinessObjects.RedditZorkQuestion
{
    public interface ICanEatHere
    {
        void EatFood(Character character);
    }
}

ICanSleepHere.cs

namespace BusinessObjects.RedditZorkQuestion
{
    public interface ICanSleepHere
    {
        void Sleep(Character character);
    }
}

Item.cs

using System.Collections.Generic;

namespace BusinessObjects.RedditZorkQuestion
{
    public class Item
    {
        public string Name { get; set; }
        public List<Item> Items { get; set; }

        public Item(string name)
        {
            Name = name;

            Items = new List<Item>();
        }
    }
}

Kitchen.cs

namespace BusinessObjects.RedditZorkQuestion
{
    public class Kitchen : Room, ICanEatHere
    {
        public Kitchen(string name) : base(name)
        {
        }

        public void EatFood(Character character)
        {
            character.Heal(6);
        }
    }
}

LivingRoom.cs

namespace BusinessObjects.RedditZorkQuestion
{
    public class LivingRoom : Room, ICanSleepHere, ICanEatHere
    {
        public LivingRoom(string name) : base(name)
        {
        }

        public void EatFood(Character character)
        {
            character.Heal(3);
        }

        public void Sleep(Character character)
        {
            character.Heal(3);
        }
    }
}

Room.cs

using System.Collections.Generic;

namespace BusinessObjects.RedditZorkQuestion
{
    public class Room
    {
        public string Name { get; set; }
        public List<Item> Items { get; set; }

        public Room North { get; set; }
        public Room East { get; set; }
        public Room South { get; set; }
        public Room West { get; set; }

        // Some boolean variables, to see which direction you can move.
        public bool CanGoNorth { get { return North != null; } }
        public bool CanGoEast { get { return East != null; } }
        public bool CanGoSouth { get { return South != null; } }
        public bool CanGoWest { get { return West != null; } }

        public Room(string name)
        {
            Name = name;
            Items = new List<Item>();
        }

        public string Look()
        {
            string whatYouSee = string.Format("You are in the {0}. ", Name);

            foreach(Item item in Items)
            {
                whatYouSee += string.Format("There is a {0} here. ", item.Name);
            }

            return whatYouSee;
        }
    }
}

Test.cs

using BusinessObjects.RedditZorkQuestion;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace TestBusinessObjects.RedditZorkQuestion
{
    [TestClass]
    public class Test
    {
        [TestMethod]
        public void TestMethod1()
        {
            // Set up the rooms
            Bedroom masterBedroom = new Bedroom("Master bedroom");
            
            // Add an item to the master bedroom
            masterBedroom.Items.Add(new Item("Queen-sized bed"));

            // Add an item that contains other items
            Item dresser = new Item("Dresser");
            dresser.Items.Add(new Item("Pants"));
            masterBedroom.Items.Add(dresser);

            LivingRoom livingRoom = new LivingRoom("Living Room");
            livingRoom.Items.Add(new Item("Couch"));
            livingRoom.Items.Add(new Item("Big-screen TV"));

            Kitchen kitchen = new Kitchen("Kitchen");
            kitchen.Items.Add(new Item("Fridge"));
            kitchen.Items.Add(new Item("Stove"));

            // 'Connect' the rooms.
            // Here's one simple way, although there are certainly better ways
            masterBedroom.West = livingRoom;
            livingRoom.East = masterBedroom;

            livingRoom.North = kitchen;
            kitchen.South = livingRoom;

            // Create the starting character
            Character character = new Character("Joe Smith", 20, 15);

            // Put the character in a room
            character.CurrentRoom = masterBedroom;

            // Check to see if the character can sleep here. If so, sleep (which will heal the character).
            // You do this by checking if the room implements the ICanSleepHere interface.
            // This will always be 'true' in this sample, but I'm showing how you'd check to see what extra thing you can do in the room.
            if(character.CurrentRoom is ICanSleepHere)
            {
                ((ICanSleepHere)character.CurrentRoom).Sleep(character);
            }

            // Here is how you'd see if you can eat in this room
            if(character.CurrentRoom is ICanEatHere)
            {
                ((ICanEatHere)character.CurrentRoom).EatFood(character);
            }

            // If the player typed "GO WEST", check to see if they can move West.
            // If so, set the current room to the room to the West.
            if(character.CurrentRoom.CanGoWest)
            {
                character.CurrentRoom = character.CurrentRoom.West;
            }

            // If the player typed "LOOK", display the room information.
            string display = character.CurrentRoom.Look();
        }
    }
}