Jarek,
keeping any dog with teeth around people can be trouble, and the bigger the dog the bigger the potential trouble.
Dog attacks on people (no matter adult or child) lead to breed specific legislation in the US. Just ask anyone who has a 'pit bull' or type dog... it means you cannot own such a dog in some municipalities, in others you cannot get insurance for your home when you do, and everywhere it is very expensive. (In some places pit bull is any dog that looks like one, or might have similar 'fighting' breeds in it, which is determined by people who know very little about dogs, as in, "it is brindle, thus it is a pit bull").
That being said, of course someone with experience and dedication can handle any dog in a city, as long as there is emphasis placed on selection for temperament, training, socialization, and so forth.
It is most likely easier in Europe than in the US, where dogs are not part of normal public life.
(Dogs cannot be on public transportation, are not allowed in many public venues, from most buildings to parks. There are open air things like flea markets/farmer's markets that prohibit dogs, and I cannot take mine to Home Depot, a lumber store. Further people here are not savvy about dogs, approach without permission and the dog owner can get sued for a dog bite by a trespasser or burglar, even if the dog defended you!).
I have had a dog in Europe, and it was rather different.
If you love a breed of dog, you want to be sure that people own this breed are responsible owners and handlers of such a dog, or else they may ruin it for you and the breed. That's how it is on this side of the world.