I only stayed one night and i am so sorry I was unable to extend my stay. I loved this hotel. There are three different areas of hot spring areas, but the rooftop at night can not be beat. Absolutely wonderful. In all, I soaked in 8 different hot springs pools.
There was one person at the front desk who spoke English. She came to my room and explained all the rules, since this hotel is sort of like a Ryokan where people walk around in the bathrobe things (even to the buffet). My room was huge - I don't know why some other reviews say their room was small. My floor mattress was comfortable and I slept very well.
The woman at the front desk told me about a night cherry blossom festival. I took her advice and went there, and it was truly the highlight of my Japan trip. I walked from the hotel. The lit up trees were beautiful, and they had Geisha dancing women.
The dinner and breakfast buffets at this restaurant were absolutely outstanding. I couldn't even sample little bites of 50% of what was available - there was so much variety. And it was the only time I was able to enjoy a green salad on my trip (they don't serve those in Japanese restaurants!). There is a time reservation system for dinner and it seemed to work well.
I didn't utilize the bar, but I was grateful that the hotel has vending machines with beer and wine coolers.
There is a refrigerator in the room and the WiFi worked well.
I used the two day Tobu rail pass. There is a shuttle bus from the Kinugawa Onsen station. Just ask at the information center when you get off the train, and they will direct you to the shuttle stop. The shuttle driver will ask your hotel. It was about 210 yen for the shuttle. The hotel has a direct shuttle (for a fee) to Top of the World and Edo Wonderland. Tip: You can take a free bus from Edo Wonderland to the JR train station in Nikko. It is a big red bus and the times are listed clearly at the bus station.
If you have the Tobu rail pass (which you buy online before visting), you can go back and forth to Nikko and Kingwasen Onsen and ride all the buses to the shines, the lake, etc in Nikko. The buses to the lake don't run very often in the afternoon, so if you want to see the famous waterfall maybe do that first and then visit the world heritage area afterwards.
I loved Nikko and enjoyed my stay at the Asaya hotel immensely!!!