Splitting the diswasher cost seems fair. Or have the LL pay and raise the rent a bit. My only concern would be – is there space for it? If it is taking up the only cabinet space, then I’d say no.
I have had tenants paint before. The rule was – either I agree to the color up-front or they paint it when they leave.
If the place needed paint, I paid for the paint itself. If the place had good paint and they just wanted a color change, I wouldn’t pay for paint.