We (young couple) stayed here for one weekend and had an above average stay. The flat is very charming, though small, but it has everything you need for a short period.
The place is very central, but seems somewhat sketchy at night.
Travel lightly, since the flat is on the 5th floor with no elevator.
Yoann is a very nice and helpful host - communication was great.
If you are staying on a budget in Paris, this is a good place to stay at.