There are no mandatory extra charges. Only options like daily cleaning.
I am not positive about free washer and dryer being available if in a studio. In a one or two bedroom there is a washer and dryer in the room. Seems to me if you are in a studio you have to go to the laundry room and the machines were coin operated. Not sure though.
As far as towels. You do not have to use your room towels for the pool. They have nice big fluffy towels at pool side (no charge). So basically all you need your room towels for are drying yourself off after a nice warm shower or jacuzzi bath.
I agree with Happy Birthday Cat. That 11% is a killer. Make sure you factor that in to your math.
ttfn