The biggest difference is that the hotel can be used from one night stay without a contract. As it is a rental house, a lease contract for at least one month is required.
Also, there is no apartment manager or concierge service available at the site.
When you move in, a staff of the operating company will hand over the key, guide you to the facilities and provide an orientation.
Inquiries during your stay are mainly handled by staffs by phone. (24/7 by bilingual staff, English and Japanese)