Duplex-Madison...am I on the right track?

[Douglass Belt]

Duplex for sale $220K, each unit is 2Br, 1 bath. $1100/month per unit. Taxes $5600/year. As I understand it, this would fit the 1% rule, however, not sure if the numbers work. 

• assuming 30 year mortgage @ 4% PITI =$1589/month. Tenant to pay utilities, trash, lawn/snow removal.
• Principle= $302/month
• Interest =$696/month
• Taxes & Insurance =$592/month

looks like $2,200-$1,589= $600/month in cash flow.

Yearly capex needed $2,000 according to owner. All mechanicals, roof, etc are less than 5 years old. 2 gas ranges and washer/dryer may need to be replaced in next 5 years.

Easy to rent as close to capital, university, etc.

What do you think? Also, I am sure I may be missing some information, so please let me know. This is the first analysis I have posted. THanks!