Gema's apartment is conveniently located 10 minutes away (walking) from Atocha station in a quiet area. The apartment can be a little cramped for 3 adults, but it would work fantastic for a couple with kids as everything is in one big room (no door to the bedroom, just a hallway). The apartment is on the Basement level, and we all 3 were awaken on Monday around 5 am from the heels of people walking on the above level. So if you are light sleep, this might be a problem.
Gema is a great host, we had great communication before arriving, she even bought some distilled water needed for a CPAP machine since we arrived after 10pm. I love her washer/ dryer. Providing the manual for the appliance was a big plus!! as it was different but easy to use by reading the provided instructions. She also provide several power outlet converters which was very convenient. She also provides coffee, tea and all the necessary little things for cooking (olive oil for example).
There are two supermarkets like 3-5 minutes away. I love the little market down the hill (Santa Maria de la Cabeza) and both Mercadona and Lidl. We ate at the restaurant across the street (Hong), and the one down the hill (Luijo's bar) and they were both good at good price.