The good: This apartment is very conveniently located a stone's throw away from the metro stop Liege, which makes it very easy to get around Paris if you don't want to walk. Although there isn't a washer, it's very close to Laverie Saint-Petersbourg which was easy and convenient to use for washing clothes. The apartment itself is very tidy and well-kept. The kitchen space is very small (but manageable) and there is a mini-fridge to store everything. The shower is a little slippery but otherwise easy to use and the water heater heats up the water decently quickly. The check-in was easy (that is to say, we were sent a door code and the instructions on how to use them were clear), and we were given a small plate of assorted welcome cookies, coffee, salt, and pepper, which was very welcoming. The towels were folded neatly on the beds and we were given mini shampoo and conditioner which was a nice touch.
The Bad: I honestly wouldn't recommend this place if there are more than 3 of you staying, unless you are okay with being in a very cramped area. Our party of four was very cramped, and I can't imagine how much tighter 5 or 6 would be. There is very little storage space, which is only really a problem if you have big suitcases or a lot of stuff to bring. (as a sidenote: the The air conditioning does not reach the rooms at night, but does cool down the common space, which resulted in the people sleeping on the sofa bed being freezing cold while the people in the rooms were incredibly hot (this was in the middle of July). Opening the doors to the room did help a little, but a downside is you get less privacy of course. A minor nitpick is that there was no spatula for cooking, but that wasn't really a big deal because we just used forks instead. Also, the bathroom is quite small which wasn't an issue for me since I'm quite small, but some of my taller traveling companions did report that they bonked their head against the door.
Overall I think this is a decent place to stay as long as you know what you're getting into, and I would probably pick it based off of location and how tidy it is. I would probably stay again if it were 2 or 3 people going to Paris.