Remove the cats if at all possible at they are the most immediate threat. Just one well placed claw or a bite before you can intervene could be too much for a 6 gram gecko to survive through, so I wouldn't risk the cats finding him before you do.

Most of the time geckos go upward, so look on top of blinds, lights, etc. If it is light in the room he will most likely hide until it gets dark. I would recommend turning out the lights and sitting quietly in the room listening for him to come out and start moving around. This may be easier said than done depending on exactly how large this studio room is.

If you don't find him tonight, leave food and water out somewhere close to the last place you saw the gecko. He may not find it if he has wandered a ways off, but the next danger is dehydration so any water sources you can provide may help until you can find him.