If you need a cheap haircut a good option is the school of hairdressers. You can also get your eyebrows fixed and eyelashes coloured. All treatments are done by a hairdresser school student, under the supervision of professional trainers.It is important to go with enough time as the treatment might take a little extra time.

You can get a haircut for 99 DKK. They have plenty of colouring options as well at pretty low prices. Colouring of eyelashes and eyebrows: 50 DKK

Website: http://www.kbhfrisoerskole.dk/ (Where you can find a detailed list of prices and opening hours of each unit).
Link directly to booking: http://kbhfrisoerskole.bestilling.nu/

The school is divided into three units located in central Copenhagen in Vesterbrogade, Frederiksberg and Valby Langgade.

Vesterbrogade 28, 1 th, 1620 København V – (main office)
Valby langgade 100, 2500 Valby
Nordre Fasanvej 40, 2000 Frederiksberg
Phone numbers:  33240533 or 31105654