Franck's place is close to many sites around Paris. It's located near the metro station, so it's pretty easy to get around. There were some difficulties getting in and out of the place though since the door often got jammed.
Unfortunately, we arrived at Franck's in the middle of a heat wave, so the apartment got quite hot without air conditioning. A fan was provided, but that still wasn't enough to combat the record breaking temperature. The windows opened right onto the street too, so we couldn't keep them open at night. Might not be the best place to stay in the summer.
The place was average in terms of cleanliness. There was stuff left over from previous stays in the refrigerator and in the washing machine, and bugs had a tendency to fly in. Otherwise, everything else was clean.
Only other issue was WiFi. It was down when we went, and it wasn't resolved while we were there.
Overall, I think the place was alright but needs some improvement to make it better.