How safe is Guatemala City and which zones should be avoided?

According to the British FCDO's travel advice, no part of Guatemala City is free of crime, including Zone 10 (the Zona Viva), popular with tourists and foreign residents. In Zone 1 (the Historic Center) tourists have been targeted by opportunistic criminals; zones 18 to 25 are known for higher levels of crime (the FCDO recommends chain hotels and researching the area), and zones 6, 7 and 8 should be treated with caution. The FCDO describes Guatemala as having one of the highest violent-crime rates in Latin America, although most serious crime involves local gangs. The current U.S.