The installations and the pools are very big. The price is quite reasonable and staff are friendly.
The pools are divided into connected inside and outside sections but also into several mini-zones (all part of the same large pool), such as a whirlpool section powered by underwater jets where you can spin effortlessly, in the water, around the jacuzzi outside (the two jacuzzi's are seperate but embeded in the main pool); a zone with a small waterfall; a dark section for more discreet encounters; an embeded but seperate mini-pool with cold water; a mini-pool with warmer water; a medium-sized pool - completely separate from the main - where you can just float and relax, listening to the relaxing music played underwater.
It's open every day until midnight (very convenient). There are also many other facilities: A coffee shop where you can get something to eat in your pool robe, by the pool. A sauna and massage area as well as an outside rest-area for warm days. At a significant extra cost, many types massages -- face, full-body etc.. -- are also available.
Strangely, while in the water, many people seem to cling to each other in pairs. As long as they use their common sense and discretion, no-one seems to mind a little making-out (the pools are big enough for everybody although they do ask you to keep affectionate contact and caresses to a minimum). So it seems the spa is also a nice aphrodisiac.