Kin + Ilk
Little Man Coffee Co
Nata and Co
Pipes Brewery, tucked away in Pontcanna and available at various bars through the city.
Urban Taphouse, Westgate Street - run by local brewery Tiny Rebel, a better selection and cheaper than Brewdog which is on the same street.
City Arms - the classic Cardiff Rugby pub, opposite the Taphouse. Good selection, relatively cheap.
Gwdihw Cafe/Bar/late night dancing
The Grazing Shed (burgers)
Got Beef Co (burgers)
Vegetarian Food Studio (veggie indian)
Canteen on Clifton Street
There's lots more to choose from, but those are some of my favourites.
Have fun and stay safe!