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My friend had a Warre and was always moaning about it although I don't remember why. They aren't as stable and it blew over once. So I wouldn't stick one up on a flat roof. I've got a Top Bar, similar idea - foundationless, natural - but even simpler and more stable. I'd recommend it.
To be fair, you can set up and forget almost any type of hive. They are likely to die of Varroa infestation unless treated, but that's not too much effort. The main effort is inspecting once a week during swarm season. If she doesn't do that, they'll swarm but if you are in a rural setting and don't mind losing half the bees that's not necessarily a problem.
Bumpetty Bump.
I went to an interesting lecture a couple of weeks ago about Warre hives, and there is a very accessible flat roof at my parent's house. Anyone have any experience?
Mum was a beekeeper years ago, and wants a hive or two around, but doesn't feel up to the work. Warre hives are relatively hands off, so seem ideal. I can get there every so often to faff about a bit, but mostly the bees will be left to get on with it, and on the roof they won't bother anyone.