The flat can be reached by both Metro 9 (Charonne station) or Metro 2 (Alexander Dummas). The location is good and the welcome procedure was easy to follow. There are many food stores and supermarkets around.
Check in/out time was also flexible. It's truly a better choice than hotel if you arrive Paris so early and leave so late. You don't need to carry the luggage in the waiting time.
The only one minus point is the sanitary. The flat was not well cleaned. Dead flowers and unwashed bed cover & blanket :( So ask the host about this problem in advance or simply bring your own blanket.