@Evan Stephens I haven't purchased a property yet- still looking. The two things I discovered that I wasn't estimating enough for were Capex and utilities. And sometimes property taxes.
Since Akron properties are pretty affordable, using a percentage of either rent or purchase price for a Capex estimate isn't super accurate since it costs about the same to maintain a 1000 sq ft house that rents for $800 as it does a 1000 sq ft that rents for $2000 in another part of the country. If you're planning a major up front rehab, you can keep that estimate a bit lower, but I've seen a minimum of $180/month recommended for an older home. Keep in mind that repairs are separate- Capex is only large expenses where repairs are the day to day things that break. You need a separate budget for that.
Utilities are another issue- it seems pretty common for the landlord to pay utilities in Akron, especially water/sewer. The city of Akron got cited by the EPA for their current sewer setup and are replacing all the pipes over the next several years, which has significantly increased water bills. If you're looking at a place with tenants in place, make sure to check who pays all the utilities.
Last, always check the assessors site for property taxes. I looked at a house where the taxes were $1550/year and then looked at another one a couple blocks away of similar size and value and the taxes were $3450/year. I've read you can contest the taxes with the city, but if you lose the higher taxes can kill cash flow pretty quick.
Good luck with your search! I'm likely going to start with a single family BRRRR to get some experience and start the process of finding a contractor I trust, but I hope to eventually move in to multi-family.