Earlier this week, we rented two scooters from Sean Ly (pronounced 'See-ann Lie') for two days. After checking the brakes and doing a quick test ride, we decided it would be a good deal to rent them for $4USD/day. My bike ended up being a total gas-guzzler where a 7km trips uses up 1/4 tank. The speedometer, side-mirror and gas-meter all became non-functional. By then, we were too far away from Kampot to switch out for a new one. The engine had issues, where it would completely die if I wasn't on the gas enough.
When we went to return the bikes, a woman punched in numbers in her calculator, to show 3 days of rental. We had arrived 2 hours after the 'return time', even though we had told the owner, Sean Ly that we'd return them at another specified time and he said 'OK, I charge only 2 days'. Sean Ly was conveniently not there, 'sleeping' and unreachable. The woman became very hostile, held on to our passports and we ended up paying her $2 extra so she'd let us go.
It's not about the money, but the principle. I've rented scooters in Ubud, Bali for $5/day and explored the entire island for 3 days and only re-fueled ONCE. I spent $10 extra on gas just for my piece-of-crap bike in Kampot.
tip: Bring a photocopy of your passport (because you might need the passport to show your guesthouse/hotel) & have something in writing if you can.
even better tip: Don't rent from this shop!