Julien's place is overall great, really central location and a pretty great little (very little) space. The stairs are no joke, but not as bad as we thought they would be in the end- you get used to it pretty quick. I'm 6'4" and there was only a little hallway of space where I could stand upright in the apartment without worrying about hitting my head (it's smaller than you think it is). Also there was a pretty loud bar downstairs that I didn't see mentioned anywhere, we were able to get to sleep but light sleepers might want to take heed- after 10p it can get pretty loud til about midnight if you have the windows open. We appreciated the free espresso, but we did have to hunt for it in the wall drawer under the table with the coffee maker on it. Overall a pretty good value.
Separate from the apartment, anyone looking to travel to Paris in August be aware that a TON of places close for the month of August. We naively had no idea and it took some getting used to- really hard to tell what's open and what's closed in August in Paris.