Reading around tips about Russia in general, what i found common between the travelers are tips about Police "stealing" your passport and asking you for money to get it back.
This (i would call it myth) is absolutely wrong, or not right anymore, i don't know.
Most of those tips, i would say all of them, are back in time of many years.
Talking about my experience, i didn't had any, and i say any problem at all with Police, i haven't been stoppen, and i crossed many of them in the city, but never had any problem.
Russian winter can be really cold, but at the same time temperature and weather can change from a day to the other.
So when it's really cold, you will see ice hanging from the houses roofs, pieces of ice that are like swords, but be careful when you walk, don't stay right below them, because you really never know, are they gonna fall or not ? well sometimes when the temperature raises, they are.
Be careful where you walk.
well.. happy family having their picnic.. and just a couple of meters away from them there's a pile of garbage.. and nobody cares..