This was my first Ryokan experience, and it was incredible.
Shinkai used Lake Suwa as the inspiration for Tomorrow in Your Name. As a huge fan of the film, I wanted to visit Suwa to see the place for myself, and wanted to do it while staying at a Ryokan. Shinyu offered a room with a lake view, so it sounded perfect.
Every staff member was incredibly friendly. For English speakers, they have all the important information in English and most of the staff spoke English well enough to be able to help you out. Don't worry if you don't speak Japanese!
Top tip: if you speak "tourist level" Japanese like me, at dinner, just use English. They have English menus with descriptions of the food and an English speaking staff member will attend to you. I didn't do this, and the staff member passionately explained the origins of the appetisers. I understood almost none of it, and felt very guilty afterwards for letting him speak!
After a lovely dinner and relaxing soak in the Onsen, I watched Your Name in front of the lake view. If that sounds perfect to you, do yourself a favour and go!
On the way out, I mentioned to a lovely staff member that I came because of Your Name, and she recommended visiting Tateishi Koen before I left. If you're reading this: thank you so much for being thoughtful and recommending that. It was nothing more or less, than a breathtaking view.
Fantastic Ryokan in a fantastic location.