Stayed two nights in the larger unit which was spacious (late June). It was a good value for money, but didn't feel very comfortable for a longer stay.
1. Location is very convenient, next to Massy RER C station. More useful RER B station is a few minutes walk away across the lanes.
2. There are three supermarkets close to the hotel and a Japanese retaurant, which was quite good and airconditioned.
3. The unit didn't have a dishwasher.
4. Breakfast was not a good value for money, use the supermarkets and the kitchen.
5. Double bed was only two single beds attached to each other.
6. It is right next to train lanes and gets lots of sunshine (until 10pm in June) which made the top floor unit somewhat heated. There was no airconditioning.
7. When the window was open at night (to make it cool), we got mosquitoes.
8. The unit had lots of space outside bedroom and had many electricity outlets.