The experience of staying in Marie’s apartment is not nice. Overall, I cannot recommend it and I would suggest you stay somewhere else during your visit to Paris.
The check in / check out / concierge process is a disaster. We confirmed with Marie that we could arrive 30 minutes early for our 3:00 check in. Marie told us the apartment would be ready, and said that if we had any issues, she would respond within “5 minutes.”
To pick up the key and check in, we had to go to a key locker in a laundromat about 3 blocks from the apartment. The code Marie gave us to the key locker did not work. We messaged Marie about the issue, multiple times, and did not receive any response until 6:30pm, almost four hours after we arrived. Thankfully, the delay did not entirely ruin the day — after waiting for Marie’s response in the laundromat with our luggage for about two hours, we decided to try to enter the building without the keys. By chance, we ran into someone in the elevator who said he was working on cleaning the apartment and that it was not ready yet. We weren’t able to stay at the apartment but thankfully he let us leave our bags so we could be free to explore the city.
Check out was also a mess. We were first asked to drop the keys off at a different laundromat, then it was switched to a hotel almost 20 min walking from the apartment. When we arrived at the hotel, the code we were given didn’t work, and we had to wait while the hotel management resolved the issue.
All of this resulted in significant amounts of time spent messaging Marie, waiting for responses, coordinating, etc. We were in Montmartre for only two days, so every hour counted and I am frustrated that we spent some of that important time dealing with these issues. Read through the other reviews here — this is not an isolated issue, and others have had experiences as bad or worse than ours. Save your time and stay somewhere else.