I do see that a car might be a bad idea, but I plan to move to a new city about every other day, so I thought a car might be easier. But if the cost is too high, I will forget it. (I'm still calculating out the costs)

I have checked with my car insurance company and was told that they do not cover international rentals, so I would need some other insurance. I'll check with my Amex card, but I don't think they provide primary coverage for a rental vehicle. If forced to get the rental company insurance, it will definitely make the car idea too expensive.