Can't help with a specific hotel I'm afraid, but just in terms of country awareness - both Spain and Italy are brilliant for coeliacs. There are HUGE gf sections in even the smallest local supermarket and there is a massive GF market in both countries.
Awareness of CD is very high, and in my experience of eating out - there is generally a high level of education amongst waiting staff, much better than in the UK.
Not that this will prevent you from being glutened of course, but I think it does help to make you feel more confident about eating out.
Good luck in finding your special hotel. I'm sure people on here will have favourite places they go to. BTW, I did see a brochure last year from Schar or Juvela who were offering GF holidays at European hotels - might be worth a look.