I booked this at short notice when driving back to the channel ports from the south. The room was clean with a comfortable bed and decent bathroom. Plenty of free parking and the Wi-Fi was fast and reliable.
I can't really comment on anything else as I stayed on the 15th August and, like much of France, the place was practically shut save for the one helpful receptionist.
Not much to recommend Mantes-la-Jolie though, it manages to be a big place with very little going on and where the 'Jolie' part of its name comes from appears to be a bit of a mystery.
- Free Wifi