We stayed at the "Park & Suites Confort Carquefou" for 2 nights. The staff are friendly enough and helpful, which is a plus. Rooms are large and beds are comfortable. There is a kitchenette. Plates, pans, cutlery are all supplied, but there was no washing up liquid, so prepare to buy your own! There is a small on-site gym on the ground floor but I did not have time to use it. Seems to have fairly modern equipment though.
The only really bad points was that (1) the rooms are not cleaned every day and our waste bin filled up very quickly. (2) The corridors outside on our floor smelt bad our entire stay. The decor was quite 1970s too. If they updated/cleaned the corridors, or at least emptied the bins, then i'd have given a higher rating.