Large a/c bus from Ekkamai 131฿ or you can book a taxi which is approximately 1200-1500฿ and takes about the same amount of time, 2-2.5 hours depending on traffic.
I suggest you use Agoda for looking at or booking a hotel. You can use the filter option to pick and choose what options you want/require. I’d say you won’t have to worry about the hot water as almost every rental there will have it.
If you haven’t been there before, I would say 5-7 days to get the feel of the whole of Pattaya. If you’re going to party and drink only, a couple of days would do. If you get bored, jump on a boat over to Koh Larn for the day or stay a hour there.