Berlin, Munich, Frankfurt, Brussels, Paris.... all signatures of human advancement. Not too many high rises though, not very crowded either, but just advanced. The most important aspect is of course transportation.................all had a dense underground network. At least 6-7 lines criss-crossing the city. And yet it is impossible for anyone to get lost. Local transport includes, buses, trams and regional trains as well. At any stop, one will get directions to the nearest stop for other modes of travelling. Information is also given about the timings of all these public vehicles.
All cities have some central squares with lots of people, often tourists. It is good to walk through these areas. And of course, one can't do without museums in cities, but in these European cities there seemed to be too many of them. Some cities like Berlin have a good night life. Mostly the youth are free and accepting, but it always helps to know their language. The cost of living in different cities is different. Paris more than twice as expensive as Berlin. To end off this wiki-travel like post, I must also add that the cities have way too many churches. Apparently God still exists here.