We booked Hotel Thermal as we were travelling to the Musilac Music Festival and didn't have a lot of choice in the town.
Overall, I would say the hotel is quite strange and sort of reminded me of Fawlty Towers! There are weird cabinets in the reception selling beauty products and the decor is a real mish-mash of colours and patterns! The room itself was very basic but was very clean, however, it didn't seem good value for the £62 we paid.
On arrival I asked for an iron and staff seemed to look at me like I'd asked for something totally out of the ordinary. I was told there wasn't one and I said 'in the whole hotel?!' and the response was 'No', with no apology.
On the plus side, Aix Les Bain is a charming town and the hotel is very central. Also, it has parking on site at a cost of 4 Euros a night.