The apartment itself is close to Atocha station and Lavapies metro station, so travelling around was easy. It is also close to some dining places so you don't have to worry if you arrive at night or return late from a day trip.
Marta's place is very clean and as nicely furnished as it is in the photos. Marta and her husband are very nice and gave us plenty of sightseeing advice and dining options, clearly indicated on a map of Madrid that they kindly gave us. They checked on us to see if everything was okay and made sure we had everything we needed. Marta is very responsive and was able to accomodate to meet our last minute request.
We really appreciate their thoughtfulness and would recommend their apartment.