As regular readers may know the present Mrs H and I stayed in Letoon many times when we first started visiting Calis.
Since then we have stayed in hotels and rented apartments. The later is our preference by far these days.
We do have certain criteria for our accommodation, the quality of which we are fairly flexible about but the single most must have is a pool.
We normally visit in June and September and a pool is absolutely essential for us. We simply could not survive in July and August without one.
PS As I've said on here before I do not agree with non residents using pool facilities at hotels. That's my personal opinion.