Working on securing my first deal here are the numbers. feedback!

[Brad Jordan]

I am currently working a deal on a duplex that currently has 100% occupancy. One tenant has been there for 11 years and other 2 years. They just resigned their lease before the property went up for sale. 

price: 160,000

Rent: 1,600/ Month

Payment for 30yrs at 4.12% with 40k down, based upon 100/ month for Insurance is roughly 899.

The Furnaces in both units are older but working great and one ac was replaced about 6 years ago but the other is well aged.

Numbers seem to work great but being my first deal and not working with any partners it makes me question myself. any advice or feedback would be great!