FranD:
The Cova Cafe is not a "free venue," you will pay for specialty coffees and teas. However, the beverages are very good. I really enjoy the cappuccino. However, if you are used to Starbucks giant coffees, the Cova Cafe serves a smaller (normal) size beverage. A cappuccino is less than $3.
I have not been on the Horizon, but on three recent cruises on the Summit and Inifinty, I frequented the cafe almost daily. Also, on these ships there is a patisserie (pastry bar) open in the morning and afternoon with decandent pastries. They are free. If the Horizon has the patisserie, order a coffee, have a treat, and enjoy.
Freelancer