Cottage.. Thingy

Hey guys, for my second post I put together a small cottage-hotel thing? Whatever you make of it, it's a 4 story building. There is a total of 8 rooms, and 1 opening in the top with no connection to the rest of the building (sorry!).
But once again, any advice is welcome; and if you know how, can you please tell me about Flatgrass maps, I seem to spawn all over the place..
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Building Entrance: X:1358, Y:5, Z:413. Sorry if you guys have to travel!
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*Any tips on designing the interior are needed!*