Comment by whyonearth

You have to get clever when searching CL. Plenty of places that allow cats don't click the "Cats OK" box. Instead of using that search filter, include the terms -"no cats" -"no pets". In your case, -"no couples". My CL searches to filter the fake 1BRs get pretty crazy (-roommate -"room for rent" -jr -junior -studio, etc...) but their search engine handles complex queries well.