Great apartment - it's snug, but had everything for two of us. The host , Axel was very helpful and responsive. He also accommodated us very well for checking in - we got to the apartment about an hour late and he was there waiting fur us and helped bring our luggage up the two flights of stairs. In 2 minutes he explained everything we needed to know about the apartment and the area.
The good: location. It's close to Bastille and a very lively bar/restaurant area; metro is 2 minutes away; and its on a private street, so the apartment is pretty quiet.
The bad: nothing really bad. It's just really small - I hit my head with the bathroom lamp a few times. But it's Paris...
The ugly: the apartment was a bit dusty when we got it. But we vacuumed and opened the window, so it was fine.