Is an 80x190 cm mattress wide enough for an adult?

Yes, 80 cm is a workable single width for most adults, though it is narrower than the more common 90 cm single. The 80 cm width offers less movement space than a 90x200 cm mattress, which is the most widely recommended single format for adults. For a guest room or a secondary bedroom where space is the main constraint, the 80x190 is a practical solution; for a primary bedroom, most adults sleep more comfortably on a 90 cm wide mattress.