If you are SERIOUS about your coffee then the Barista Lab is your choice cafe in Geneva: they have a comprehensive selection of beans from various third wave roasters in Europe, and it's clear that the folks here know their stuffs. Try their butterfly pea flower latte, it is as delicious as it is beautiful!
There's also a huge variety of freshly and homemade dishes (think avocado toasts, pancakes, brownies and banana cakes). Portions are also huge here which is great for brunch.
The atmosphere here is also airy and cosy, and there is a nice seating area along with bars facing the windows, perfect for people-watching while sipping on your cuppuccino. This is one cafe that I will return to over and over again.