There are a lot of Polish people in Coleraine! If you know anyone here, you'll probably have better luck contacting them than here on tripadvisor.
If you will be here in the summer you could try the University of Ulster website as student accomodation is often available.
accommodation in the 'Triangle' area can be quite pricey in the summer. If you intend staying during student holiday-time, try the University of Ulster, Coleraine campus. They may let out their halls for the summer hols. If it's out of peak season, there are plenty of apartments in the Portrush/Portstewart area that are likely to be vacant. There is currently a glut of apartments in the area -should be some relative bargains after August.
Try McAfee Estate Agent website, they do lettings locally.
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