I think you should go check it out.
You should make sure that the yard is secure enough for Nebo and that the neighborhood is safe enough for you to live alone.
Who will be living in the other half of the Duplex? Will it be the guy who is renting it to you?
Do you need to sign a year long lease? I don't know if you could maybe just try renting it for the summer months to see if you like living alone and if you can afford it.
I really think it would be good for you to live on your own for a while at your age, plus you will have Nebo so you won't really be alone.
I'm sure you will meet people in the area when you take Nebo for walks or go to the local dog park with him.
Good luck!