That's a great place! Exactly as described: beautiful apartment in the very center of Madrid. You can walk to any place and, to be in the very center, the apartment is very quiet! you do not hear any noise from the steet!
We were 7 persons and every body slept comfortably in a bed (or sofa bed).
There was some shampoo in one of the bathroom but as we were 7 persons, we had to buy shower-gel, shampoo and toilet paper (there's a supermarket at 5 minute walk).
We couldn´t meet Rafa as he was out of the city when we arrived but we did meet Marco that welcomed us on friday night to give us the keys (Rafa answered our emails quite quickly every time we had to contact him). We had to packed our luggages (and be out of the place) at 11am on Suday but were allowed to leave them in the entrance to pick them up later (at 3pm), so that was great.
I would definetely recommend this place for a short stay (not to live there as the apartment is quite dark being a first floor, interior).