We stayed a week in Angelina's apartment. Her parents warmly welcomed us. They had set out some snacks, and showed us the features of the space. Angelina had helpful information, including maps and the names of 2 neighborhood bar/restaurants where the tapas were good. The apartment was small, clean, but perfect for 2 people. There were lots of nice little extras.
The location was great. We were in a very vibrant neighborhood, but heard no street noise. Lavapies metro station was 2 blocks away, and Tirso de Molina station about 4 blocks, and Atocha Station is a 10 minute walk. But you could walk everywhere. We walked as far as the Palacio Real in less than 30 minutes. There are lots of tapas bars in the area too.
Angelina called us several time to make sure everything was OK, and helped us find a laundromat. We were very comfortable and enjoyed our time in Madrid. If we get back to Madrid we will definitely book Angelina's apartment again.