Everything was actually better than advertised! The bathroom is bigger than what the photos show, and there were nice details such as flowers in the bathroom, and a scale, the Netflix on both smart TVs, and a great sound system for enjoying music. Last but not least, all the major attractions are within walking distance, so after 3 days in Madrid I have no idea how the Madrid metro looks like :)
The hosts are very friendly and accomodating. They gave us great advise on where to go, especially where to eat (we're vegetarians), and they even left Spain's best beer in the fridge for us to celebrate when we arrived!
So to sum up, I totally recommend this place, and if the next time I visit Madrid this place is available, I will look no further.