We spent about a week at Flavian's place. It has many perks and just two things some might see as downsides.
Perks:
-Location: Within 5 minutes walking from everything, including places to shop, subway, and the Eiffel Tower!
-Great host: Flavian went above and beyond to make sure our stay went great.
-Flavian's English is great, so if you don't speak French, it won't be an issue.
-Perfect size for one person, totally fine for two, even though I would advise against extended stays (again, we spent a week there and were totally fine).
Downsides:
-8th floor. No elevator. That'll keep you fit. But if you come with luggage it might not be super fun.
-The place, even though very well designed, is small. You have to pick between the bed or the table, basically. But honestly, the size of the place was not an issue: who would go to Paris to stay in an appartment?
We would definitely come up if the opportunity arises!