We had a very pleasant experience. The location is perfect - central and quiet! We did not use any transport - all the Old Madrid and beyond is walkable from this apartment.
The apartment is small but cozy and sparkling clean and you have everything you need. There are no views, the windows look into patios. But the pros of that is that the place is very quiet. Returning there in evenings we felt at home.
Our communication with Raul was very smooth and effective. In the beginning and during the stay he gave us good tips on site-seeing and entertainment. He also ordered a taxi that took us to the airport at the last day.