Stayed 2 midweek nights in January 2012. Weather wasn't great so we spent quite a lot of time in the hotel itself.
Its a large hotel with a wide range of services, but feeling a little dated due partially to the functional architecture, but also decor e.g. wallpaper in rooms, strong patterned tiles in bathroom. Otherwise room was great, clean and spacious,
Great buffet breakfast, huge choice, layout means a bit of a scramble through guests and waiters though.
Nice indoor swimming pool with loungers, we whiled away a morning there. There's also a small fitness room with treadmill, and a games room with a table tennis table.
If you want dressing gown to waltz around in you have to go to the bother of getting it from reception and you will be charged. Supply of towels is free though, I made do with a couple of them.
Parking: hotel is at the top of a short but steep hill, parking at the top 11 Euro per night. I'm fit and didn't mind too much walking up/down the hill to park in the public car park below at 4 Euros per full day.
Found it annoying that Internet connection (choice of wifi or LAN) was charged... seems very old fashioned compared with most hotels I stay in for business.. I think it was 5 Euros for 1 hour (on stopwatch), 20 Euros for 600 mins spread over any time, not cheap.
We ate in the 'English Pub' but the service was very slow - we waited nearly 20 minutes even to order a drink - and the food wasn't great quality either. In particular we ordered the 'Harzroller' cheese pizza for my wife, she is vegetarian, but it came out with pieces of ham in it (unfortunately a common occurnece for veggies in Germany). The waiter guys were nice but there were only 2 of them dealing with a half full zone and they could not be attentive.
There are a range of nice cafes and restaurants in town just 10 minutes walk from the hotel.
We tried the 'English Pub' again next afternoon coffee/cake, one guy handled the 3 tables fine, but menu was frustrating - they were doing a combined coffee+cake price but the nice cakes displayed outside the 'pub' were not included in that offer
There were a couple of small snack packs and water in our room - they were probably gratis, we couldn't see any price list for them or the mini bar, but we didn't dare touch them for fear of being charged. I don't like that feeling.
Summary: Very nice and comfortable hotel, you get a lot for your buck, but you will be royally charged for ;extras' like internet.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.