Is a 4% mortgage on a townhouse too high?

[Robert Aiken]

My buddy has a 3.75 on his single family home and is encouraging me to shop around for a lower percentage. Because my credit score is below a 740 (709) and the townhouse is below 100K, I believe that has reason to do with the percentage. I just wanted to know some advice on whether I am paying too much or whether that percentage is just fine. First time buyer here, so any advice is greatly appreciated. Thank you.