Inside measurements are 48” H X 76” W,
I’ll see what Lowe’s has. Anyway, your landlord should be required to replace the blind with one you can raise and lower. You shouldn’t be penalized because the previous tenant vandalized it.
The blind in the bedroom has been cut, so if for any reason it comes off the window sill, all the slats will fall to the floor.
I’ll worry about that when I’m ready to install an A/C unit in there. The ONLY thing I don’t like about the apartment is that both of the big windows face south. The one in the kitchen faces north, but there is lots of shade in the back. None to speak of in the front.