This was a really terrific place to stay for two nights in Madrid. It was extremely close to a major tourist attractions, and felt very safe!
The hosts were extremely attentive and communicative. They provided everything we needed and check in and check out went extremely smoothly via online messages.
The only thing to watch out for is the noise on weekend nights (until 3AM). If you are just getting over jet lag like I was, it was difficult to fall asleep. This is through no fault of the apartment though, and if you are someone who will be out and about anyway, this is a great place to stay!