Alessandra is a warm and welcoming host. She is really helpful. We arrived at her place really late in the night around 1 am. She welcomed us with some fruits and also offered some sushi. Which I think was really sweet of her :) We had a comfortable stay at her place. The best part is that her house is very well connected to metro as well as bus. It is centrally located, walking diatnace from SOL, so it was really convinient for us to walk around and visit the attractions.
Regarding the room, it's perfect for a single person. A bit small for two people to share. Still the bed was comfortable and there are wardrobes to keep your stuff!
So overall we had a good stay in Madrid for 2 days :)