Good location, but don't be fooled by the advertisement! I stayed at Julien's place for a 3-week school exchange, so I had the ability to compare his unit with those of my 35 classmates. Here is what I observed:
1) There's NO AIR CONDITIONING. I paid about $25-50/night more than most of my classmates because this unit advertised that it had A/C. As it was >30 degrees Celsius for most of my stay, this seemed worth the money. Not only is there no A/C, there's not even a fan. Julien eventually brought over a fan after some frustrating back-and-forth texting.
2) There will be ants, lots of them. To be clear, I camp and back country hike often, so I'm not afraid of a few bugs. I wasn't, however, expecting hundreds of them crawling through my luggage, up the walls and all over my bathroom. I'd start the day by killing ants for 20 mins so I could use the washroom.
3) The gate code may change and you may not be notified. I got home from dinner one Saturday to find that the gate code no longer worked. I was forced to get a hotel for the night as Julien didn't answer my calls or texts until late the next morning.
4) The amenities are "spartan" at best. There's no couch or table as shown in the pictures, just one small chair. There are a couple plates, a bowl, some utensils and one pan. Unfortunately all were very dirty and covered in food, so I had to scrub everything before using it. There isn't anything to flip and egg or open a bottle, so expect camping basics. The ironing board and iron are travel-size at best, so if you're travelling with business attire as I was then I wouldn't recommend staying here.
5) The location is excellent. It's 2 mins from Charles de Gaulle Etoile station and minutes from the Champs-Elysees.
Overall, I found that the unit is over-priced compared to better units in the same or similar locations. I would not recommend staying here unless you have limited options or get a really good deal.