Stayed at Andrés' flat for 4 nights at the end of January with a friend. We arrived close to midnight and he was so accommodating when arranging our access - a great communicator!
The flat is small but nicely decorated and very clean. Paris was very cold while we were there and the flat was naturally cool but the bedroom heaters were effective. I slept on the sofa bed and it wasn't the most comfy but OK for a couple of nights. Those with claustrophobia or on the larger side might struggle with the toilet which is in a very small room.
We found the area to be well connected and safe, with loads of great restaurants in walking distance.
This flat is great for a short stay!