My partner and I stayed at Xavier's for the first week of our honeymoon, and it was lovely. Sat right between two stops on the metro line 1 (one of which also has a night bus stop, if you're out late), it was easy to go jump on a train and do whatever we wanted with the day. The kitchenette was equipped well enough to make a dinner in one night (there's a Monoprix very close by!), and finding a tub in Paris?! Magical.
One morning, we had trouble with the lock jamming with us in the hall and our phones inside, but a very kind neighbor called Xavier, and he left work to find a way to get us back in. The very next day, he replaced the old lock, and everything went smoothly as can be from there on out!