My opinion... To save yourselves a lot of hassles, I'd talk some more to the landlord across the street as well as to some of the tenants to see if he's a good landlord and if it's easy to get along with him. If it sounds acceptable, then start packing... well, not literally.
When I moved down the block, all I packed were the small things. We just took the clothes out of the closet and hubby carried them to the new closet. Same with the linen closet, the furniture, etc. Meanwhile, I was at the old place throwing the loose stuff into small boxes that could easily be carried and hubby would put them away right away. Could you have your ladies help you with that?
NO STAIRS would be a wonderful blessing, I'ma thinkin'!

We won't even mention less rent.
I think it was Sabby that said to get everything in writing. Send that letter of complaint so maybe you can withold paying the rent to the present landlord to get some of your money back. If it's too much hassle... heck! I wouldn't pay him any rent anyway. Let him evict you. That depends on how you feel about that, though. It wouldn't bother me at all. LOL He owes you money for the repairs you made.
If you choose to follow through with the repairs he never made, you could even get more money out of him to help you with the move... legally, that is.
One thing to look for at the new place, how is it kept up? That should tell a story in itself.
In any event, I'd move if for no other reason than the cheaper rent.
Good luck in whatever you do, Twingie!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.