Advice needed on a Duplex Rental in Houston

[Iman Yu]

This is a duplex that I've been interested in and I would like to get your feedback on it. 

It's not a duplex that I will be living in so it will be getting a 25% down non-owner occupied loan on this one. The load we got on that is a 30 year term @ 4.37%.

The asking price for this duplex is 119k but I think we can get it at 110k because it's been on the market for 60 plus days.  Below is the spec on the duplex.

Stories:	1
Year Built:	1982 / Appraisal District
Building Sqft:	1,512/ Appraisal District
Lotsize:	6,617 Sqft/ Appraisal District

Both units are currently rented. 1 unit @ 675 and 1 unit @ 650 (tenant has been in this unit for 10 years).

Here is my calculation: 

NOI = gross income minus all expenses = $731

Total Rental Income:	1,325.00
vacancy estimate:	(109.98)
gross income:	1,215.03
property tax:	(145.08)
Insurance:	(100.00)
CapEx and Repair:	(132.50)
PM Cost:	(106.00)
total expense:	(483.58)

Monthly Cash Flow = NOI - Mortgage = $298

$1215- $433= $298

That's about $150 per unit with a pretty conservative calculation. 

The neighborhood is in Stafford so it's close to decent but I think it's still a class C area. 

What do you think?

What are some things to think about that's not on the cash flow analysis?