We went here in the pre-season, the environment is magnificent and there are sufficient places to visit. Despite of the fact that this is an area for Winter sports, everthing is opened during the entire pre-season. Advantage is calmness of the place and if you have such good weather as we had (30 degrees or more), you can de-stress very well!
The houses at Happy Hill are all equipped with a Dutch television (almost all common channels) and are all furnished with the basic things you need. Several supermarkets are in Vrichlabi (7 km), the Plus, Lidl and Penny, but they barely speak English there.
Several nice restaurants can be found, but you certainly have to visit Tibor in Cerny Dul: the owner even speaks Dutch and the menu is also available in Dutch (the grammar mistakes are really funny). Dining out is somthing you can certainly do, it's not expensive at all.