First off, Guillaume is a super, super sympa person and did his best to make me feel at home in his place. An example is that because I was in France for an extended work stay, I had A LOT of stuff with me (I was staying at Guillaume's for the last two nights of a six week long trip). The night before my departure, the elevator broke! Even though he was out of the building Guillaume made sure I was well informed of the situation, and the woke up at 6:30 the morning of my departure to help me carry all my stuff down 6 flights of stairs. So, as I said, he is very considerate, caring host.
Having said that, I can understand the previous reviews saying the place was a bit small and lacked privacy. This was OK for me, travelling alone and for a couple nights, but I can understand why earlier reviewers were concerned about this. It was not explained to me in advance that while I would have the bedroom to myself, this meant that Guillaume would be sleeping on the couch in the main room. So that was a bit, uhm, cosy.
But I would like to thank Guillaume for having me stay for a few nights, it was a good place to stay.