I chose Jose Maria's apartment primarily for the location - right on Calle Arenal and in the heart of Madrid. The apartment is great for two adults and has everything you would need, including a very comfortable look lounge, big tv, good wifi and efficient air conditioning.
We encountered a problem finding and getting access through the apartment as my phone wouldn't work but a kind gentleman on another floor called on my behalf and we were able to access the accommodation before the usual checkin time.
Jose Maria was very responsive to my emails and when we experienced problems with the TV late on our first night (I think someone had been playing with the settings and the cable TV connection needed resetting), Jose was around to rectify the problem the next day.
All up, a great experience and highly recommended if you want a neat apartment in the centre of town.