My husband and I spent 8 nights at Gabriel's apartment. We love the location! The St Michele/Notre Dame station servicing RER B and C line has direct service from the CDG airport and was about 8 minute by foot from the apartment. There was plenty of dining options in the area for all budget. It was also very easy to get to the various sights in Paris.
The bed was comfortable but the pillows were a little weird (seemed more like cushions to me)
A couple of items were missing/not functioning during our stay that caused our stay to be not as comfortable as we would like. For the example, the fridge was not working, the hairdryer was missing and the door into the unit was a little tricky to get in and out of.
The neighbor's TV noise was quite noticeable inside the apartment and it went on as early as ~7am and as late as ~11pm. Construction in the other unit was still ongoing but it seemed to just happen on weekdays and we were out of the apartment sightseeing most of the time when the construction was going on. Light sleeper may want to consider ear plugs.