Yes, in summer Prague is pretty crowded, not so charming. Walk in Zlata Ulicka was terrible. Once I visited Prague at the end of February - no tourists, but not so pleasant weather as well.

What I liked in this city? Its huge historical centre. We in Baltics have used to rather small Old Cities, but here it takes looong time to go through it - the buildings and sights are very interesting. I consider that Czechs keep their capital very well - they also have sense of taste, what is not the case with many modern Western European cityplanners and architects.