I stayed in this apartment with my family (3 persons in total) in this apartment for 4 days. The communication with Ruth went well, the place is located just 15min walk to the center of Madrid and the apartment was clean.
The apartment is pretty small, but if you are not planning to spend much time in it, it is ok.
Unfortunately the apartment is not in best shape. A couple things were broken but that didn´t bother us much. The only thing which is really not acceptable is the single bed. It is worse than all beds in hostels I stayed in before and you can´t get a good sleep in it!