The location of Pablo's flat was perfect for the errands I had to run in Madrid, it has excellent transport links and it is metres away from Plaza de la Remonta, full of bars and terraces and with a few major supermarkets, you will find anything you need within a 3 minute walk!
The flat was clean and tidy, good heating and hot water (and air conditioned if you visit in the summer), and Pablo was always a text away.
The only downside for me was the bed, as the mattress felt a bit tired, and the traditional bedding system (flat sheet, exposed blanket and cover) does not seem like the most appropriate for a holiday rental, I would have thought a duvet with a full washable cover would have been more hygienic.
Other than that, it is a great place to spend a few days in Madrid.