We have literally 1 large cupboard under the stairs (full of vaccum, mop, washing baskets, gym bags and other crap etc), we have no airing cupboard, no loft space, no porch or coat cupboard or anything like that.
I have a cost rack with a bit of shoe storage underneath in the hall, a kallax behind the living room door filled with shoes, a kallax full of DSs toys and that's about it for downstairs.
Upstairs we have a tall unit in the bathroom with some towels and toiletries in but tbh it's not big enough and I still have a basket of towels in the spare room (needs to be gone for the baby though so who knows where it will end up, I'm thinking of a slim line cupboard for the very tiny landing), it's also filled with junk and stuff for the baby that we can't use yet like toys, jumperoo etc if we had a loft it would all be up there. DS has a wardrobe and a small kallax for his clothes but I intend to get a much bigger wardrobe in the near future which will help get rid of some of the junk on the babies room. DH And I have a ottoman bed which you can fit loads in, it currently has all the bed sheets, winter coats and boots (that need to come out) and some other bits and bobs. We also have 3 large Ikea wardrobes with all our clothes in and space for suitcases on top (which are also full, but it doesn't look the best tbh).
We have a very high ceiling on the stairs and have considered lowering it to fashion some sort of mezzanine storage space but it might be a bit awkward to access due to the layout. We've also thought about adding a porch on the front of the house to give more storage for shoes and coats to free up space in the hall and living room (for other crap).
Oh and our garage is full of the Xmas tree decs and other stuff you'd normally have in the loft really.
When we look to move, storage is an absolute must. Utility room, porch or coat/shoe cupboard, airing cupboard, loft, built in wardrobes, the works! Haha.