How to hang things n really crumbly walls?

Find the stud in the walls....that may be what you need to hang things on. Some walls just won't hold anything...even with anchors. Another thing that might work is Command Hooks.....Command makes velcro where you put a piece on each side of your artwork and a piece on the wall where it will hold. Won't mar the wall at all.

I think your only option is to get freestanding shelves which can display and store many items on the shelves and on top. You can do ceiling to floor or any size you need and can buy them new, used or find them in garage sales, thrift shops and on the side of the road.

I would go with both Pat's and Fisher Luce's suggestions. Make sure anything that goes on the walls are within your rental agreement. If you use free standing pieces you will be able to take them with you and won't cause you to loose your damage deposit. I would avoid putting up shelves because of what you need to do to the walls to keep them up.

Oh boy! I wonder if the house is actually safe to live in?

Finding the studs would be easy with a simple knock on the wall. It sounds hoolow, there is no stud there. If it sounds solid, there is a stud! If the floors are tilted and there are no studs in the walls, you may be living in a tree house! Have a serene holiday season!

Be careful that the foundation is stable and secure for all of you to live there. .If it slants that much I would be very worried my self. If it has two stories they could come crashing down. .Somehow to me that landlord is a little fishy

Please be careful. .Have a Great Holiday.

Get anchor straps for any free standing furniture you put in your house. I rented a huge three story house for fourteen years that was over 100 years old. Everything we put against a wall leaned out from the walls. I anchored or put shims under everything, including really tall bookcases that I shimmed and they never fell the whole time we lived their. We are avid readers, so every bookcase was filled and some double stacked to hold most of the books. I used the plastic shims, they don't compress like the wood ones do, I even use shims under my aquariums now to get them level in the house we are in now (vintage 1954).

Storage = bookcases obviously your walls don't support weight probably cause they are old plaster walls, and you will be paying for the repairs. Use command hooks for pictures.