I'm not sure who had the idea of calling this the "Grand Hotel", but that person must have had a strong sense of irony. This is a rather basic hotel, and it is not in the best state of repair.
Pros: central location, beds are fine, although the bedspread was distinctly dilapidated. The previous reviewer's comment on the double-glazing is important - the streets are filled with noisy revelers until the middle of the night on many evenings. The room was cleaned every day, and the hot water was reliable.
Cons: my entire room was dilapidated; some parts of the floor subsided when I stepped on them; door missing from tiny bathroom; bed was the only comfortable thing to sit on; minimal storage; ugliest room decor I've ever seen. Extortionate internet rates (the service is fairly reliable, though).
I do not list the breakfast among pros or cons, as this depends very much on an individual's taste. A large cup of coffee and hot milk, a very crusty roll, yoghurt, apple sauce, and a couple of mini-croissants, delivered on a tray. Identical. Every day.
Staff were generally helpful.
You cannot fault the location, though, which is very convenient to central Nantes. But go elsewhere if you're looking for something truly "grand".
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC