Wow, we got lucky booking this one!  Very communicative & helpful hosts.  Awesome location close to everything here.  Spacious, stocked, apartment - comfortable beds and couches, 2 TVs, full kitchen, washing machine, hairdryer.  Loved the balcony overlooking the harbour & Atlantic with stunning sunset views. 
So glad we found this gem, had a fantastic stay here in Portrush as our homebase for exploring NI. 
Just remember 3 stories up is actually 4 in "American".  No elevator, so you do get a good workout bringing up your luggage - well worth it!!