Yes you have insurance, but it may not cover everything.

Since you only have 2 full time and two part time staff, who covers their vacations and sick time?   

Need a few units in same buildings and higher rents to cover expenses aka nice areas. 

It may well form part of the bank valuation in terms of square foot, and it may be covered in the habitation license (the habitation license would cover house + annex), but it will be treated differently and need to be closed off for rental.

Do you have vandalism as a covered peril?

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

The amounts of square footage cover is so low the delta becomes a rounding error. 

If the water bill is $100 a month, increase the price by 20% (or whatever you decide is fair) to compensate you for the time required to split and bill and to cover additional use when tenants squander the utility.

Also, are you trying to avoid one with an ice maker--potential here for additional maintenance if any issues arise.I've had Whirlpool, Samsung, Frigidaire in properties without any issues.Make sure you're aware of what the manufacturer warranty covers things such as parts, labor, and compressor.  

Ben Russell has done an excellent job of covering differences in the lease.