We stayed 3 people 6 days long at the apartment.
It's big enough even for 4 people, and very well equipped (especially the kitchen). We were provided and introduced to everything we needed. The building and street are generally quiet, but not isolated.
Metro stop is a minute walk away, and there are plenty of shops and restaurants in the area. L'est train station about 15-20 minutes walk away (or about 5 with Metro).
Communication was great before and during the stay, and solution were always found, even regarding arrival and departure times.
the kitchen and living room are spacious and cozy and there is no problem cooking and eating together at home.
The room downstairs might be a bit small for 2 adults and doesn't have a window, but other than that it's fine.
I strongly recommend this place and thank the hosts for the smooth and positive experience!