Richard was a very friendly host and the apartment was close to the metro station, but I wouldn't recommend this place.
There was no AC in the room, even though it was advertised on the site and for visiting Madrid in August, this was a criterion for choosing the accommodation. Instead, we were offered a ventilator. Also, apparently the washing machine was broken so we couldn't use it, but Richard offered to take our clothes to the laundromat together with his.
The bathroom was full of dog hair, which was quite off-putting, but the dog was in fact cute and playful.