Cockroach Prevention

Hi edhat readers, I need some advice. I've lived in Santa Barbara for over 30 years in a variety of homes and I have never seen a cockroach. I've been renting a small 1930's cottage for the past 2 years and just in the last few months I've seen 3 cockroaches.
My house is very clean but because it's old, there are numerous cracks and a general lack of insulation. I've only seen these in the bathroom and kitchen at night. Do I have an infestation or are these a few stragglers, and how do I get rid of them for good?
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