If your are looking for a mortgage remember to compare as many options as you can and check all the rates and conditions, here are some factors that can affect your mortgage interest rates:
1 Credit Score: Is very important for you to have a high Credit Score because this means less risk for the lender and this way the interest is lower.
2. Down Payment: Usually if you put a higher downpayment the rates can go down.
3. Lown Term: If you can afford a shorter term then you can get also better rates but your montly payments will be a little higher.
Remember to check all the conditions of the lenders so you can get a low interest rates with the best conditions available.