You don't give any indication as to size, but id it's on separate heat it's likely at least 2br. It won't be $600 every month, but when it's very cold if you like a warmer temp it'll be very, very expensive. A lot of the oil heat apartments are older without great windows and other things. We've had a really mild winter, but yes budget as if it could be even higher than $600/month for a few of them.