The room we first got at the Jersey was quite terrible. However the hotel neighboring (Altinea) was by the same owner so we could upgrade us (for a little too big fee, but we just couldn't find ourselves staying 2 nights in the first one) to a room with a seaview and balcony there - and that was great. The stuff were helpful and very nice, and everything worked out well in the end... but I guess it should, for that price.
The area with the promenade was great.
HOWEVER don't book the cheapest room at le Jersey.