I was lucky enough to spend a week in Madrid using Felip's apartment as my base. Whilst I only met Felip's Mum who let me into the apartment, he was in communication checking to see all was good.
I found the bed comfortable, the Internet consistent and the shower hot (although a tight squeeze for a more fully figured person like myself) but I had generally more than enough space to make myself at home.
The Tirso De Molina neighbourhood had plenty of mini markets, a supermarket and a really good fresh market near La Latino metro station. I checked out the "Rastro" street market on Sunday too.
The apartment is also located very centrally with the Royal Palace Museo Prado, Reina Sofia, Puerto Del Sol, Plaza Mayor etc all within easy 15-20 minute walking. Good time had!
Gracias Felip!