We stayed at Sylvain's place for a week-end and it was brilliant! The flat is perfectly located in the lively 11th arrondissement, near Bastille. Lots of bars and cafés around which gives a typical "Parisian" atmosphere.
The flat itself was really pleasant to stay in: clean, bright and quite spacious considering the central location. Everything you could need was provided.
We didn't get the chance to meet Sylvain but he has been helpful and arranging with check-in / check-out. We would definitely stay there again!