Valentin's place was as described, and he was very responsive and professional. There was just a couple of things that would be helpful: First, his name on the mailbox, where key's stored, is not very prominent, so it took me a while to find it; second, there was no hair dryer, at least that i could find. I didn't bother asking him because it was not that important and because I kept thinking that I'd go and purchase one myself.
The apartment itself was very clean, and, since we were staying for nine days, I paid for an extra cleaning, which was well worth it. I didn't read carefully, although it's clearly stated, that the place is pet friendly, so there was pet hair here and there and on my clothes, but not enough to ruin my stay.
The location is IDEAL, and the rate I paid can be considered a DEAL. It is a few steps away, literally, from a supermarket, pharmacy, shops and restaurants and the Saint Paul metro station, not to mention the Carnavalet museum and le Marais. Well worth it!