The flat is spacious and stylish, a great place to stay, with everything that you would need. The living area is very comfortable and the pictures really do describe the place well. We really loved staying at the flat, and wished we had more time just to relax and enjoy the space. The proximity to major transit point is great, but also because it's close to Gare de l'est it's an area you might want to be on a slightly higher alert. There are lots of restaurants and bakeries around, with a supermarket right across the street. The street is quite busy at night and can get a little noisy, but the bedroom is on the other side and isolated from the street noise.
It's got a one-floor walk-up (no too bad for Paris), just in case you have large luggages. Check-in information was clear but since you have to pick up keys from a different location, make sure you plan a little ahead of time.
All in all, great place to stay!