@Susan Grinde Whether or not it's a good investment depends on your goals/intentions with the property. If you intend to move out in 2 years and rent the portion you were living in out to another tenant, you'd likely want to evaluate the property as if you weren't living in it at all and make sure that it was hitting the returns you were looking for. That is - being able to cover the mortgage with someone else's money is great, it doesn't automatically mean that the cashflow on the property is hitting the rates to make it a great investment.
In contrast, if this was your forever home and being an owner-occupant was the plan in perpetuity, there are still clearly better or worse deals you could make. Since you're not making money on the cashflow, you will need to look to make money on some other piece (appreciation, tax benefits, or loan amortization; betting on appreciation is a gamble, and tax benefits aren't really a moneymaking vehicle [more just a money saving vehicle], so you're pretty much just left with trying to amortize the biggest loan possible).
Does that all make sense?