I have an elevator. Probably it's necessary to have an emergency exit so I think there are stairs ...

There is no free entrance parking lot. It is best to call the front desk once and check.

Something between 7500 Yen to 15000 Yen, depends on the room and the day you choose.

It is quite good

I used this to visit the legal matters of Misonoen in the Tokyo headquarters, but I checked the emergency exit notation, so there are stairs, あり