Hotels for Self Quarantine in Sapporo

We will be traveling to Sapporo,Japan at the end of July from India. There is a requirement for self-quarantine for 3 days. I’m looking for places to book accommodation for quarantining. Are there specific hotels that allow this quarantine facility, or do we need to intimate the hotels beforehand about quarantining there?
Also, how strict is the quarantine checks? Are we allowed to share a room with the person we have travelled with, as long as we are isolating from everyone else?
Any leads or experiences would be helpful. Thanks in advance,