Disadvantage of seller financing with decent terms

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Hi,

I am currently going to purchase a multi family but as a condition the seller wants to use him as a bank and wants to finance the deal. He is offering a 4.5% 7 year loan. 

My question is what drawbacks are there or disadvantages are there with seller financing besides the usual being locked in and not able to move the property if needed. 

I am currently a buy and hold investor so i don’t see the drawbacks. The building cash flows very decent and it’s in a good area of California.

I just wanted to see if there were any other angles I haven’t taken into consideration in regards to seeing the drawbacks of this financing.