pratar svenskA....
It has an A at the end as it is the noun. 'Svensk' is used as a singular adjective, e.g. "jag aer svensk" (excuse the incorrect characters there) among other things (it is the 'den' adjective end). "Svenska" is the plural adjective: "vi aer svenska" as well as the noun.
learn somthing new every day.
Never been to Gothenburg I'm afraid so can't offer any tips.