House in Canada MUST be rented to a third party paying a "fair" amount of rent. This "rent" must be claimed as income in Canada. Make sure your expenses equal rental revenue.
or you'll be paying tax on the rent.
Re being in Canada.. limited to 180 days a year.
Also..Cannot have any substansial ties. Ie.. Car / Bank/ Club memeberships
As stated Rev Canada is sole judge on whether you are maintaining ties with Canada. If you have one thing, ie keeped your drivers license, then that likely will not consitute a tie. If you also have a car insured and registered in you name, it likely will.