Shuz4me – This will sound completely crazy (but hey, it could be worse 
) grab some tinfoil and get creative with the vertical blinds.
You didn’t say how tall the window is – but a stepstool might be tall enough…
You can crimp the foil over the top and edges of the blinds (no need for landlord approval). If you are careful and use several sheets they can be taken off and put back up again – that way you can have guests over. Just so you know, I have done this in the past and it worked very well (but, it was a bit unsightly).
I didn’t use the garage, but I figured out I could fit in the top part of the bedroom closet and shut the door….
REPORT ABUSE