In good weather you should go for dinner at the restaurant on the top of this improbable building:
The restaurant is a little posh, which is very "Moscovian" (don't know how to write such an adjective in English). The panorama over the city is impressive.
I'll be going myself to Moscow in a few weeks, by the way. I never get enough of this city. Your observation is right on spot, people are friendly.
Traffic never slows. It really doesn't.