Yes, you can deduct mortgage interest as well as property tax and maintenance from your investment property in Canada . If you own multiple units and you are the one managing them you should also open a property management company and charge your properties a management fee which is also tax deductible.

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Since i only rented for 3 1/2 months, my losses (after subtracting mortgage interest and property tax) will be huge. of course, i'm not complaining since it's a tax deduction -- and at least i'm getting some rent now -- but i'm not sure if the mortgage interest and property taxes need to be prorated and declared in different sections of the tax forms or not. do they?

Yes. You need to pro-rate the interest you paid for 3-1/2 months for use of the rental. It goes on Schedule E as a rental property. Don't forget to add depreciation expenses, legal fees, taxes, etc. related to the rental, and your rental income. The rest of the mortgage interest and taxes should go on your Schedule A deductions, subject to the $1M limit on debt.