Townhomes as strictly rentals

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Being new to this I am curious to see what some think about purchasing a town home as being strictly a long term rental property investment. The few I have been looking at are close to a military base which mean there really wont be a shortage of renters as there will always be the influx of service members looking for off base housing and offering a good place to live is always a plus. I remember some of the off base housing I have seen when I was in the Army and the rent was nuts for a rat hole. For example two that I am looking at are under 70K each, need minimal upgrading (paint, carpet, cleaning) to get it ready to rent and they are in good areas. Property tax assessments on each is + 10K over sale price. Going by what I understand the 50% rule to be I will get a 53% return every month on rent. Not really looking to sell it at a future time, but rather hold on to it for a long time. Any pros cons about this method since its a town home? What do other investors think about owning town homes?

Thank you
Chris