Deal: good, bad, mediocre?

[Will Barksdale]

BP, Looking for the community's opinion on a deal, here's the numbers: Duplex worth about $100-110. Current rents: $1200/month. Deal: $100k, $5k down, 6%, 30 year amort seller finance. Cashflow with current rents is $100/month total after all expenses run through the BP calculator. Property is being leased about $50-$75/door UNDER market. No significant repairs needed. Appreciation rate locally is about 3%. Thoughts? Thank you in advance! -Will