Luis and Vanessa place is just what you need and more for a visit to Madrid. In the heart of the city so no transportation fees whatsoever needed to explore most of what Madrid offers!
I would personally say that the service we received is comparable to what you get in 5 starts hotel, communication was great, a nice bottle of Spanish wine was awaiting us in the kitchen, super clean and even though the building is in a noisy street, this was not a problem as the apartment itself was on the backside of the building which made it calm at night and the early morning.
I will definitely contact these guys again when I come to Madrid, you can not simply get a better deal than this!