Cinque Terre (Vernazza):
In Vernazza, we also had the pleasure of staying in an amazing place, La Malà. And, of their 4 rooms, they might have one that is perfect for your group.
Room 26 has 2 separate sleeping areas. Upstairs, there are 2 single beds that can be locked together into a larger (queen sized?) bed. Downstairs, there is another room with a single bed. Back upstairs, there is an ottoman that can be opened to form another bed. I'm not sure whether it would be possible to move that downstairs, but I suspect not, both due to inconvenience and the downstairs room being quite small. If this worked for you, I believe that it would be 270 Euros (190 for the room for 2, plus 40 for each additional bed).
Getting to La Malà requires climbing quite a few stairs, through the charming alleys of Vernazza, but most places require a lot of steps. But, once you're up there, you won't be able to believe your eyes. It has a stone terrace that literally hangs from the cliff, overlooking the sea and with a spectacular view of Vernazza's watch tower.
Virtually unheard of in Cinque Terre, breakfast is included, at a bar on the town's square (Piazza Marconi). And, a nice touch is the free stocked mini-bar (beer, juice, and water).
Again, not knowing your budget, I hope that these suggestions have been helpful.