I have stayed at Javier’s place a couple of time while in Madrid studying Spanish. It is comfortable, close to grocery stores, restaurants, bars, museums, the Lavapies metro station, and the Atocha train station. I would definitely stay there again, as it is a great base from which to explore Madrid, and given its closeness to the Atocha station, a great place to take day trips from Madrid. Javier is very responsive, and check-in/check-out were very easy.