Dolores and Jose - the hosts - are great, they communicate and explain everything necessary, even give you tips on possible trips and places to visit.
I loved the apartment's location, it is in a neighborhood that is not very "touristy" - i felt that it was mostly locals around so the shops and bars were not overly expensive. It is a little far from the "party" side of town, but fairly close - walkable - to the city center, so think about what you want to do when visiting.
Everything in the apartment upon arrival was clean and nice, and the AC cooled it down even in the recent heatwave.
I would definitely recommend Dolores and Jose as a host for your Madrid trip :)