I googled for many choices of hotels at Lake Toya and finally decided to go for Kohan tei after reading reviews from trip advisor.

I booked from Japanican and the rate was very reasonable for a family of 4 (2 A 2 C) in a Japanese style room with breakfast (restaurant) and japanese style Dinner in the room. They prepared western style dinner ( really big portion) for my 2 children age 3 & 7 . My children were soooo happy especially my elder girl who was able to apppreciate much better. The hotel had even provided Yukata (japanese robe) for my 2 children for their respective age that fit them perfectly well. The chambermaid who was assigned to service our level was very good, she explained to us about the room and also explained the dinner course by course in Japanese when serve. Unfortunately we don't understand much about Japanese. However we roughly know what she was saying thru body languages. The front office personnel was not good with English as I was asking for a bicycle shop and I had a hard time explaining to the reception. Nevertheless I got a map from him and was able to rent the bicycle and we cycled around the lake and really had a good time.
The view is fantastic as it is right in front of the lake ( majority of the hotels are in front of the
Lake).
The fireworks was a bonus as it right in front of your room and the onsen was great as well. There are 4 onsen for the female (3 outdoor and 1 indoor).
I would want to come back for more.
the chamber maid who is also the person

I found this hotel to be absolutely perfect. The room we were given was beyond expectations. It was very large with two beds on one side and Japanese tatami, low table and zabutons on the other. The view of Lake Toya from our room was fabulous! The lobby was beautiful and nicely decorated. The staff were very friendly. The buffet style breakfasts and dinner was delicious with such a huge variety of mostly Japanese cuisine. Very conveniently located within walking distance to ferry boat ride to islands and a short bus ride to Mount Usu. The hot baths were wonderful, with phenomenal view of Lake Toya while sitting in hot, wooden tubs outside under the stars. It was magic!
The only thing that I can say negative about this hotel was that the bathroom in our room smelled of cigarettes, probably coming from ventilation system. But since we took all our baths in the hot springs, it was not too much of an inconvenience.

Good: Fast email response, one of the open air onsens is fantastic, nice view from room, convenience store is nearby.

Drawback: No vegetarian dinner, no free bus service from JR Toya

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Room stayed: Jap style room with view of Mt Yotei and Lake Toya

Hotel is in front of the lake. Fantastic view from the hotel lobby. Wi-Fi provided at the lobby, so you can surf internet and enjoy the view at the same time.

Front desk staffs are very friendly. One of them can speak English quite well. They have quick response to enquiry email. I am so concern on this because not all hotels I booked in Hokkaido during this trip had replied my email, even though the hotel is grand.

One of the open air onsens has fantastic view. I was lucky to 1st experience the open air onsen when it was snowing, cool!

Room is big (especially I stayed alone). it has good view of Mt Yotei and lake.

Hotel doesn't provide vegetarian menu, so the room rate I paid is considered slightly higher (6500yen including onsen tax, without any meal). Anyway I feel still worth it.

Too bad that no free bus from JR Toya is provided. Although they provide bus from Sapporo, not practical for me to go back Sapporo from Noboribetsu just to take the free bus.

You may take Donan bus in front of JR Toya to Lake Toya bus terminal (320yen). Quite a far distance to walk to this hotel from the bus terminal though. But take it as opportunity to explore the area.

I did take the bus from hotel to Sapporo. It passed by Niseko and Jyozankei. Enjoyable journey because of the nice scenery after snowing.

Never try but you may ask the hotel staff if they allow you to alight at Jyozankei Onsen bus station. Since they response to email, drop them message so that you can make neccessary planning to save cost and time on transportation.