Stayed in Jose's apartment in Madrid for a week in October and cannot think of a better place to stay! Jose was very welcoming and provided me with all the information I needed to check-in and find my way around Madrid.
The apartment is located close to Plaza Mayor but is away from the hotels and tourist shops so you get a real taste of life in Madrid. It is also within easy walking distance (30 min) to Atocha train station and surrounded by restaurants, cafes and shops.
There is everything you need in the apartment and it is spacious enough for 4 (tho sleeping arrangements may be awkward). The only minor criticism is that the upstairs loft ceiling is very low, so not recommended for people over 6 foot tall.
I would be very happy to stay at Jose's the next time I am in Madrid.