The people of North Iceland have one of the few distinct accents left in Icelandic. Until the mid to late 20th century, most regions of Iceland had their own accents, but only the North has retained theirs into the 21st century. Unless you speak Icelandic, this is unlikely to affect your stay much - and even if you do speak Icelandic, there are no difficulties of understanding involved. However this can make for an interesting topic of conversation with locals. The people of North Iceland, as the rest of the Icelandic population, mostly speak good English.