Interest rate is just one part of the equation. Its a tree in a forest. What is the amortization schedule? Downpayment requirement ? Is the rate fixed for 30 years or Adjustable rate? is it a first financing or refinancing terms. Is it based on "Good" credit score (720-740) ? Are they charging any points to get you that rate?
.Put it into a spreadsheet and see how much is your cash flow. After getting a cash flow, does it meet your investment criteria for this year. After that check for next 3-5 years or longer.
Based on my past 3-6 months experience, if you are just talking interest rate for 30 years fixed with 30 amortization and 20% down for a good credit score. That's a bad rate. You can get it at 5% rate easily if you shop around. Talk to a few mortgage broker and shop around. Be patient and get the best deals. The lending business is complicated in terms of numbers with many ways for lenders to make money. Its very competitive too as the economy is so strong and many investors are blindly jumping into RE.
James and Shanti