Ruty's apartment was very nice and clean, and perfect for a short stay. The bed was very comfortable, and the bathroom was tiny but spotless.
The apartment is in Lavapiés, an awesome neighborhood to explore but also a 15-minute uphill walk to the heart of Madrid.
Ruty was extremely responsive and easy to communicate with, and WiFi in the apartment was very fast.
As of late April 2018 there was some construction work in the building - something to keep in mind if you plan to be there during the day as it gets noisy (no problem at night).
Thanks Ruty!