I think some ceramic plate or cup would fit better the whole setup. Maybe it’s a bit pricier, but looks a lot nicer!
I think every coffee would lose its aroma when left open for a long period of time. That’s why coffee has to be stored in and air tight container.
Ah, yeah. Ceramic would have been better. It would even be more classy.
I am not sure about the aroma. What I observed with instant coffee is that it melts and hardens when exposed.