I stayed in the Park Inn Takasaki hotel for a week during the 12th International Aikido Federation Seminar. It's a mixed bag :
-there is plenty to do around the area entertainment- and foodwise
-there is a floor with a relaxation area, laundry machines et cetera
-the staff's English is not great. Some basic Japanese is recommended.
-although it's close to an entertainment area, it's quite a long walk to the city centre.
For the rest the Park Inn has everything you would expect from a Japanese hotel. The staff is friendly, there is a breakfast area et cetera. I enjoyed my stay.
- Free Wifi