We really enjoyed staying in Carlos's apartment. It's on the upper floor of a beautiful old building in a fantastic location a stone's throw from the Pantheon in the centro historico. The apartment was immaculately clean and simply but very stylishly furnished. It is also much more spacious than we expected, with the two en-suite double bedrooms down a long corridor away from the kitchen, living room and single bedroom. It was very quiet despite being in a very built up part of the city. The single room is tiny and right off the kitchen, though this personally didn't bother us. Carlos was also very helpful and quick to respond when I got in touch needing a recommendation.