There is no room service and when we were there in February there were still rooms that we're not renovated yet. As for hidden fees - none that I recall. The only two issue we had was 1) when the kids opened up a single bed that was out in the open, they wanted to charge us for using it. Apparently there was a small note that wasn't visible stating that you get billed for using the bed if it's opened. 2) we booked through a third party for a weeks stay and they refused to give us our rewards points. Other than that it was a great stay! The location and water park make it my favorite place to stay while visiting Disneyland.
There is no room service since there is no restaurant on the property. Only the rooms in building 1 are renovated, but they say they are planning to renovate building 2 this year. No hidden fees, just a $20 hold ($5/day average), which is returned upon check out. If you get an extra bed (they call it a "rollaway bed") then there is an extra charge, like $15, but they usually tell you about it. It is not a hidden fee, either since there is a tag on the bed when it's folded that tells you about the charge if you open it. Also, if you bring more than one vehicle per room or want to leave your car parked past 3 on your check out day, there is a $20 charge. But that's still cheaper than most places (Disney included) charge!
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