I'm not sure if this is the answer you're looking for exactly, but for the last few years my boyfriend and I have always made sure we went self catering. That has been an apartment in Paris, a gite in Normandy, a cottage in Scotland, an apartment in Andalucia, and soon again an apartment in Paris. We find that going to the supermarket and stocking up means you can comfortably eat vegan and still go out for meals if you like. Just make sure there is a dishwasher!
I've booked almost all my accommodation through this site: http://www.holiday-rentals.co.uk/
Apartments can be very reasonable, though Easter will be a busy time.