As an owner, you will be responsible for the roof, siding, etc. through an assessment fees.Assessment fees are payments the homeowners' association (HOA) collects from owners to cover expenses the HOA is responsible for, but that aren't covered in the regular monthly fees.

An optimal BRRRR really requires that you purchase with cash (or something cash-like) and not conventional financing. 

I own A 4 plex.. 2bed/ 2 bath washer and dryer no hoa about 7 mins west of Summerlin paid 370k bac kin feb 2019 ( that was considered high compared to the rest of the areas I was looking in ) Put about 15k into it. it appraised for 430k this month collect about $3250/ month in rents. there is still opportunity and good things going on in this market, just might be harder to find. inventory for mfh now is very tight and expensive.

As far as a loan goes, you’re more likely to find financing if the tenants all own their own homes and you are just collecting the lot rent.

Property management involves listing, showing, collecting rents, scheduling repairs, managing tenants, etc.  

They're usually faster and have equipment that makes the job take less time than a DIY person, plus if their fix fails for whatever reason tomorrow they should come back and fix it on their dime.But is saving money on DIY repairs the optimal way to increase net income? 

Then you become the resident/manager who collects the rents and makes sure your roomies don't tear up the place. 

That's the rent you collect, and not including any expenses such as utilities, furniture, supplies, cleaning, etc. 

It was some time in November when the total rent collected from the 2nd group exceeded the purchase price of the house.

You will likely have an easier time collecting on any damages from them than a random tenant.