I lived in Madrid for 6 years and was really pleasantly surprised by the room. The location is excellent and for the price (I payed less than 20€ a night) I think you get amazing value for money. It is important to note that the other rooms are also rented out on airbnb. Also, the walls are a bit thin and the floors are quite squeaky (as it is an old build) but those are minor details so I would definitely recommend