Over all, the apartment was clean, and suited our needs. Located close to grocery, laundry facility, and RER E (about 30 mins to Paris center via same). However, there are some things to note if you plan to stay here:
1) This is a locked senior facility with a different name compared to booking online (Stella, not Zenao). If no one is present at front desk, you will have to wait until someone comes along with a key fob. This can take quite a while. You can call if you have a cellphone with an international plan. We didn't.
2) There is no housekeeping unless you stay longer than a week. We were left to figure out what to do with garbage and recycling.
3) Front desk closes in the early evening, so if like us, you check in and have no bedding or pillows, you have to wait until the next morning to get that remedied.
4) French only. If you are not fluent, use a translation app.
5) The power would randomly go out while we were cooking (happened on at least 5 occasions during our stay). We had to keep resetting the breakers.
6) We booked for a group of 7 in two rooms. Each room had only two towels. No dishcloth or drying towel for the dishes. No broom/dust pan. No hand soap, body wash, or shampoo. 2 rolls of toilet paper provided for the week.