I will be in Istanbul just overnight. I need a place to stay before I get on a ferry in the morning. I could also stay near the docks if there are hotels there. It's at Yenikapi Feribot Terminali.

Sorry, was looking for something in the $50 USD range.

I once stayed at the Florya Park hotel, I think it is a good choice if just staying for one night.
Rate is about $60 USD including breakfast. Yes it is a little old building. Rooms are small. Breakfast is okay. Yet it is safe, staff is helpful. Last time I arrived at 6 am...and they allowed me to check out at 2 pm to catch my flight.
Call to reserve, don't trust the taxi driver...this is my experience, especially you are travelling alone as a female. Good Luck!
http://travela.priceline.com/hotel/overview-Turkey_Istanbul_Istanbul_Allstar_Airport_Florya_Park_Hotel-2814105.html

I stayed at the Airport Hotel last time I went. It was expensive but it was nice to crawl into bed right away!!

Elisabeth, how much was the Airport Hotel? How expensive? Are there any hotels near Yenikapi (the ferry harbor)?

http://www.istanbul-airporthotel.com/index.htm

Here is the link. It was a very nice hotel. Just a little pricey but sooo convenient. I came in at 1am and was sleeping by 2am. I want to say I paid 150 USD for one night. But the rates change. Also, I used the internet and had some wine from the fridge...so I paid for more than just the room.

Good luck.

Thanks. I can use that as a backup if I need to, because yeah, it is very expensive (the date I put in said 130 Euros, which is about double that in US Dollars). It's good to know it's there if needed though!

Most times I just assume it's double because our exchange rate is so bad. But it's good to know that at the moment it's not! THANK YOU.

I have never used such a currency office at any airport. I always use ATM's. (I just can't remember yet if there is one at Ataturk, but I guess there must be). These office have or terrible rates or an outraging high commission!