We stayed at Pierre's place for a week.
The place was lovely, very well and wisely made.
It's at the ground floor, and the ceilings are a little short. It's also quite small, but it really is not a problem for two.
The apartment is very well positioned, very close to the Tour Eiffel, to several metro stations and to RER C (for going to Versailles). There are several shops nearby.
We didn't meet Pierre in person, but his aide was kind and helpful.
Little things which we think might be improved (and made us leave 4-star instead of 5-star review).
First of all, the apartment wasn't thoroughly cleaned. It was not dirty, but it wasn't perfect either.
Secondly, the place is at the ground floor, and there's curtains just in the bedroom: more curtains would have been appreciated to have a little more privacy.
Third, the place was a bit humid. This wasn't really an issue per se, and one must consider as well that during our stay it rained (although not every single day, and no heavy rain). However, the overall humidity prevented the towels to fully dry, even after 24h.
Other than the little problems listed, we must say we do really recommend a stay at Pierre's place. It was very enjoyable, and a great experience.