Another_Critic is correct, it is Happy Hour you might not be able to attend, but you can get your 4 drinks each 24 hour period anywhere else. Coffee should be no issue unless wanted during Happy Hour.
If there are a lot of D, D+ and Pinnacles on your cruise, they might put a free regular size coffee per day on your card for use at Latitudes. We did not get the notification from Royal that they had done it, but the crew member at the register asked me if I wanted to use it when I went for coffee (which was very nice of him). The coffee from the machine in the Crown Lounge is drinkable, but Latitudes in my opinion is better, again this is my opinion only, but I drink Starbucks coffee. There are a lot of people that do not like it. They do not always do this, so it wouldn't hurt to ask if you are interested.
@2chiefs is also correct, great views from the lounge.
Enjoy your cruise.