Richard's apartment is perfect. Super well located, near fromfew RER and several metro lines and in a busy neighbourhood where you can find bakery, café, resto all at walking distance.
The apartment is super quiet, you don't ear anything from outside, even in the terasse.
Richard is a great host, super accommodating with check-in/check-out time and always there if you need anything.
If you are tall, be carefull as the ceiling is low on the second floor (where the rooms are) but this is quiet common in france/europe in older building. I bang my head few times ;) but I slept super well anyhow and wish I stay there much longer.
Can't wait to return to Paris and ideally to Richard's apartment.