Carlos is a great host, he was happy to adjust the times of both the arrival and drop off the keys so it would be comfortable for us.
The apartment is very clean and organized, with everything necessary to enjoy a few days in Madrid, and its location is perfect to enjoy everything the city has to offer.
There's a couple metro stops nearby with access to the main metro lines in case you want to travel somewhere a bit further away but we managed to go everywhere walking because it's right in the centre of the city.
Staying at his place definitely made the experience more enjoyable!