Carmens place is really well situated for seeing what Madrid has to offer. It is very close to Atocha station so very easy to get to and find. The beds are comfortable and the shower is very good. The apartment is small but comfortable and very nicely decorated. If you are a light sleeper you may prefer to bring earplugs as being so close to the station, & having a taxi rank outside means there is some noise but I was not disturbed at all by it.