Taxes, insurance or repairs, and then lose the property to foreclosure having pocketed what6 months or more rent payments with no expenses.  

This will reduce your risk and cash invested and if something goes wrong you wont be bled dry with never ending repairs.

. $6000 repair. 

I bought 1 House out right, I am refinancing for 100k. had 1 renter paying 1000. using the refinance to purchase the second property, and putting renter for 1400. it will also need 25k in repairs.

Told me the violation wasn't corrected in the 30 days required timeframe (yes you are correct, the repairs were done in time but they didn't come out to confirm). 

Expenses incurred before the property is in service are considered capital expenditures and must be added to the property’s basis rather than deducted immediately.This means costs like rehab expenses, repairs, and other improvements made before the property is ready to rent are added to the property’s purchase price and can be depreciated over time once the property is in service.

This ensures you have a clear picture of what repairs are needed and helps avoid surprises during the rehab.

I would definitely factor in some substantial capex/ maintenance and repair costs which could lower your returns.  

Lastly is your listing details; they read with all the story telling and excitement of a furnace repair manual. 

Nothing to get crazy about but no need to deal with tenants, property taxes, repairs, vacancies, etc. just sit back and collect.