Being in a shared house, my darkroom which was formerly under the stairs at my old house is now in my bedroom. I have to black out the door cracks and window. Mine is a master bedroom though so I am better off, but it is full to bursting point! I have my trays in a walk in wardrobe all my gear is at ground level. +1 to not leaving chemistry in the trays, I have done that with developer once, felt like I was hungover but it quickly subsided. Ensure you are careful not to spill, especially as RA4 developer and also fixer can stain and RA4 developer is nearly impossible to remove. I have old carpet placed over areas where I work, saved my neck when I used to have my trays on the wardrobe shelf which collapsed, fixer and developer everywhere! Not the odourless kind of fixer either.
Also I advise you pour chemicals back into ther bottles and don't carry full trays to and from the room, mind you I do have two floors to go down to my kitchen, so I carry the water bath tray down with the prints in it from a session, ready for a full wash. But it is doable! All the best,
Jacob
P.s if your room isn't fully blacked out there is a high chance of fogging paper and film and you should ensure that you let your eyes adjust before making judgment on weather it is sealed or not. Also if you are working at night light leaking in from Orange street lights I find doesn't fog ortho materials as quickly, so it could go unnoticed. But a high ASA film it would spell disaster or fog other films or panchromatic materials.
I dd the street light experiment not long ago on ortho materials.