The flat is really close to the metro and super well connected. It is exactly as described - the climb all the way to the 6th floor is a big one (be mindful if you have any knee problems or so). Regarding the people around the flat at night - nothing to worry about, no one will talk to you and our security was never compromised.
During the summer the flat gets extremely warm, there is an AC unit in the bedroom which makes it pleasant during the night.
The flat is well equipped and Quentin is a super host! Super easy to reach over the phone, helpful and caring. His friend checked us in and not only helped us with luggage, also showed us around.
Overall it’s a very nice flat and we recommend!