As a HMO landlord for students, we get through a substantial number of divan beds, most of which are cumbersome to get up and down narrow staircases, and made of cheap wood that doesn't last so inevitably breaks and requires repair.
After breakage after breakage we tried using these Dreams divan beds. Not the cheapest available by far, but for us they are very much worth the little bit extra it costs. Firstly the shape (long instead of wide) means they are much easier to get up and down stairs. Secondly Dreams do delivery to rooms, which is a bonus! Thirdly they are well made as one would expect of Dreams, and so far (a year since our first one) are holding up well. We recently placed an order for another 8 of these.
No plastic grip holding the two halves together from the underside, these have a metal bolted swivel plate that holds them together from either end, which is very much more likely to hold together over the course of time, and easier to fit.
Only thing to watch out for is the delivery lead time, we had to wait a couple of weeks for ours, perhaps as it was a large order.