Do these income/expense numbers work for this 3 unit multifamily?

[Andrew Michaud]

3 unit multi-family. Appraisal value 90k, selling price 70k. 15 year mortgage at 4.5%. Down payment 20% or 14k. Annual mortgage cost $6300.

Rents:

2 bed $600/mo tenant pays electric and heat

1 bed $550/mo tenant pays electric

1 bed efficiency $400/mo tenant pays electric and heat

Annual income $18600

Expenses:

Heat $850

Trash $300

Water/Sewer $1100

Taxes $1900

Insurance $700

Mortgage $6300

Total expenses before repairs/vacancy = $10850

End of year profit would be $7750. Lets take potential vacancy and repairs into consideration.. that would leave me with lets say $5000. Would this be a decent number to make it worthwhile on this property? A big chunk of expenses are coming from my mortgage which I would shoot to pay off the loan asap from other sources of income but disregarding that factor, I am curious if that is a worthwhile number on a 3 unit building. Thanks!