How much of the house can I consider as rental for Tax purposes?

[Aubrey Ford]

I bought a SFR with a completely built out In-law suite in the basement. My tax person says I can deduct a % of the repairs I've done based on the SQ Footage of the basement unit. Seems clear enough. However I am also sort of house hacking the main house (upstairs). Can I consider the tenant of the one room also a "rental"... and include the SQ footage of that room as well in terms of deductions for repairs etc? How do House hackers handle these types of things when you are renting rooms.