You can also message Booking.com to see if they can contact the hotel for you.

I’d highly recommend Wilgo!

I went to Fuji-Kawaguchi ko in May & would definitely use the train.

Contact the Japanese health department. There will be email contacts on the Japanese embassy websites in your country.

I have used both & find Haneda much easier. Also much smaller. The accessible taxi parked right in front of the area we met at.