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what do you think about this mileage? 1.9l engine 309GT
traffic was moderate (for bucharest...), outside temperature 15-20 degrees C, and most of the time only I was in the car

Well, it really depends on how you drive your car. I cannot say whether it's normal or not unless I'm a passenger of yours. This seems a bit high to me but that's because I now drive like an old man.
With my 1.3 engine I was once at something like 8-9 litres (I drive it in the city) and I'm now consuming around 6-7 litres because I'm very careful. With my GTI, which is a better comparison to your car, I was once at 13-14 litres and I'm now at 11, but once again it's about the driving, not the car. So, yes it's normal, in the city.

Yes, the city is killing us! Traffic jams not only use up fuel, but all other parts. Clutch, brakes, tires...