Important phone numbers
Emergency:
158 - Police (Policie)
155 - Ambulance (Zachranna sluzba)
150 - Fire (Hasici)
Other useful numbers:
1180 - Operator and directory inquires (Czech Republic) - but expect to wait as much as 10 min before your call is actually answered
1181 - Operator and directory inquires (international)

When to book
In Prague it can get pretty busy. Being the most romantic city in the world, does draw the tourists. This, combined with international conferences and special events, fills up the hotels and apartments. It is good to book in advance when it comes to New Year, Easter, Christmas and summer; in order to get a place. Do not just come to Prague hoping to find something, because more often than not, you won't.

Do's and dont's
It's good to avoid the taxi drivers waiting at ranks in obvious tourist locations. Hail a moving cab or call number 14014 to order a taxi. Make sure you are getting into an authorized taxi and the driver turns on the meter. It is safer to ask for the aproximate price before you get in the cab.
It's good to reconsider bringing girls back to the apartment or hotel since it can be very dangerous.
Don't park in the blue zone; if you do you will be clamped. Do not leave the car with the clamp or it is likely the car will be smashed or towed.
Don't change any money with people in the street!

Jan Farlik