This was originally a temple that was turned into a Japanese-style inn. I couldn't find anything concrete about how old the temple is, but it seems like it was built many centuries ago.
You are not going to get brand-new facilities or anything even similar. That's not the point of staying here. Walking around this place, you can really soak in the history and the atmosphere of "old Japan". There's a garden on the temple grounds with a small pond. During cherry blossom season, this place must be amazing.
The rooms come with all your basic necessities. Breakfast and dinner were served in large open rooms. I guess since we stayed during non-peak times, each family got their own room for meals. Dinner was a multi-course meal with the usual delicacies like sashimi, tempura, chawanmushi, seasonal vegetables, pickled items, rice, and a bit of Yamato beef you grilled yourself. Breakfast included stapes like grilled salmon, rice, miso soup, hijiki, and salad.
There are multiple public bath areas - these are NOT onsen (hotspring) waters. These baths are very welcome after a day of hiking up Yoshinoyama (Mt Yoshino). I don't know if this was standard in every room, but we also had a small, private open-air bath just outside our room. Having a beer while soaking in hot water and enjoying the evening view was sublime.
The hotel is located near the top of Yoshinoyama. From the hotel, it's a fairly challenging hike uphill to some observation points and temples. Other than this, there are a few souvenir shops and small eateries located nearby.
Lastly, and for me, most importantly, the staff treated us with the utmost of courtesy. We were picked us from Yoshino Station in a free shuttle bus. In my humble opinion, this level of care and hospitality should be synonymous with Japanese-style inns.
So to end, you are paying a lot to stay here. If you'd feel more comfortable at more modern accommodations, I wouldn't recommend this place. However, if you'd like something a bit more unique - staying in a very old temple that has seen a lot of history, I think you would enjoy this as much as I did.