We were a group of 4 (2 couples) staying in Paris for one night. Hadrien has a lovely apartment in the 14th arrondissement, very clean and comfortable, and he was a very nice, welcoming host.
We were travelling from the Gare du Nord, so it was a 10 min walk to the apartment from the Denfert-Rochereau metro station on the RER B line, but I think there are a couple of other stations on other lines that are a bit closer.
Lots of restaurants nearby in a lively 'quartier'; we ended up in a bistro on the rue Daguerre.
I would definitely try to stay here again if I needed a place to stay in Paris.