Very basic, bui complete. Range, small fridge, microwave, shower, orange juice, milk, instant coffee, some cooking staples. Location super. Steps from bus stop, very near Atocha main train station, minutes walking to Prado and other main museums, etc. Only warning: Stairs. 50 steps, I counted them.
A pleasure to jump from bed and prepare your breakfast right there! I enjoyed doing light cooking in the evening sometimes. Groceries stores (2) minutes from there.