We stayed at Carlos' apartment for four nights. He was very welcoming and offered good tips and stayed in touch throughout our stay. The apartment is located in the most upbeat area in Paris, close to many restaurants, bars and shops. I'd definitely recommend it! Three people fit just fine, one staying in a sofa bed. To note the apt is located in the attic of a 7th story building with no lift (as pretty much any other building in Paris). We didn't mind the stairs (nice workout!) but just as fyi.