Domestic Long Hair isn't a breed. It's the label used for a mixed-ancestry cat with a long coat, the fluffy counterpart of the Domestic Short Hair. These cats come from the general cat population, so they appear in every color and pattern, from tabby and calico to solid black, smoke and bicolor. Some resemble a Maine Coon or Persian without sharing that ancestry.
With no breed standard, size, coat texture and personality vary a lot from cat to cat. What they share is a coat that needs regular brushing to prevent mats and hairballs, and the broad genetic diversity that tends to keep mixed cats healthy. In a city of small apartments and cold winters, a cat's age, history and temperament tell you far more than the coat label does.