We had an amazing time here. It's something we're not going to forget. The staff really roll out the red carpet for you the entire time, and their dedication and efficiency is impressive. The room was lovely, with a suit of high-quality ammeneties. The dinner and breakfast courses were huge. Multi-stage set meal that were varied but incredibly delicious. I wouldn't recommend this if you are a fussy eater, as though there are some safe options, most of it is quite different for a western pallet.
Your stay here will be relatively regimented, so if you wanted to explore everything Hakone has to offer, it may not be for you. That being said, the location is right next to the cablecar station, so after checkout you can easily get to the top of Hakone mountain and do some day exploration.
My partner is a vegetarian, which they did warn us they couldn't accommodate. We managed to workaround it by swapping certain dishes and items (and my partner being more flexible with their vegetarianism), but this did require a lot of trying to identify what certain things were (they supplied a menu, but it wasn't always clear what was infront of you).
This is my only critique, everything else was an incredible experience. One I would recommend if you have the extra money and want to make a stay in beautiful Hakone that much more special.