Ok, wipes, nappies, cream and nappy sacks both upstairs and downstairs and easily accessible.
Same with my own deodorant, toothpaste, toothbrush, hairbrush etc. Keep duplicate sets in upstairs bathroom and downstairs loo/cloakroom. If you haven't got a downstairs loo, find space in a kitchen cupboard. I got fed up with getting to lunchtime and realising I hadn't had time to brush my own teeth etc!
If you have a dh, dp or other family member/friend, get them to look after/take out children while you have a "cookfest". Did this last week, making vast quantities of ragu sauce, shepherds pie, chicken & broccoli bake etc. Put into individual freezer portions, load up freezer. Saves cooking an evening meal, just defrost and reheat.
Bit obvious, but safety catches on absolutely any cupboards/draws at toddler height. Even if contents of cupboard are safe, it gets mighty boring and time consuming putting them back repeatedly.