First house-hack, long term Section 8 tenant

[Joshua Logan]

My name is josh I am a new investor. I have an up/down duplex under contract and will most likely buy with 5% conventional. There is a section 8 tenant of 14 years upstairs and wants to stay. I plan on fixing up the property trying to add value, especially the unit I will be living in while I am there Because I can do most things myself. The upstairs unit needs a full remodel and the section 8 tenants lease ends in February. I want to refinance down the road but have to fix up the upper unit to do so. So I guess What I am asking for is what is the best way to go about this? 

Thank you. I can give more info if willing to help.