Lovely area. The lake is 10 mins walk from the hotel, down a steep hill, and there are areas by it with sunloungers. The walk around the lake is pleasant and, at about 11km, takes a few hours; you can break at the far end where there are restaurants etc.
The standard rooms in the hotel are reasonably sized, but not huge, and we had a king size bed, fridge, safe etc. - though note unless you pay extra for a specific view e.g. lake, then you may get the road side and the road is noisy; with the windows shut we didn't hear it, but the balcony wasn't going to be used.
We stayed for 5 nights and I think the room was cleaned just twice in that time.
If you want breakfast in the hotel then choose it when booking - to add it later it was 25 euro per person per day..... a bit excessive compared to other similar hotels we've stayed at.
Gym - quite reasonable, if not the best; cardio and cable machines. The spa area has 2 saunas - hot and really hot; note this is a "no-bathing-costumes" zone. The pool is a reasonable size but was coldish ... the issue with that is that the jacuzzi is actually just an area of the pool with bubbles.... so not warm at all and so we didn't use it.
My main criticism, WIFI, much of the time I could connect but would get disconnected after a few seconds and then could not reconnect; this applied to phones & computer. Reported it but nothing happened. With no mobile signal either, this did mean I couldn't do online stuff I needed to do whilst there.
Juguetes para niños