Quellenhof was recommended to us by friends and they were raving about it, so we had to give it a try. Our expectations were very high and I'm extremely happy to say that they were met, and even exceeded on all fronts.
The property is huge, yet very cozy and welcoming. In terms of facilities there's really something for everyone, and it took us several days to discover all areas. We have two small children (3 and 6), and they also had a blast as there are multiple, well equipped, well maintained and safe play areas. Furthermore, the kids club was so fun that they couldn't wait to go there after the amazing breakfast. This left us, the parents, very reassured that they are in good hands, whilst we relaxed and enjoyed all the wellness and spa facilities. Speaking of wellness: I've never experienced such a variety of saunas, steam rooms, pools, relax areas etc. Furthermore, they are all in impeccable condition, super clean and well thought-out. And then there's the Sauna Team, that does the most original and diverse set of Aufgusse that I've ever come across - incredible!
In terms of the F&B: also here the variety is very large and the quality of the food is excellent. The service staff in all the outlets are also very friendly and helpful. At breakfast and dinner they try to seat families with smaller children in the same areas, and this can get a bit loud, however we saw this as a benefit, as in case one of ours decides to make some noise, it's less noticeable and hence less stressful :).
Overall we had an excellent stay and booked our next stay before checking out. Quellenhof will be the highlight of our annual calendar for many years to come, as the activities get even more varied the older the kids get.