Room service tipping

[MoreyCreek]

I like to order coffee from room service each morning.  What do you consider an appropriate tip for the room service waiter?  This is my first time on Oceania.  My previous cruises were on Princess, and I generally tipped the waiter $2 each time.  Does this sound about right?

[Paulchili]

Sounds about right. It’s not necessary but surely appreciated.