My stay in Julie's house was great! The house is perfect for 3 couples (it has 3 bedrooms with a kingsize bed in each one) and it's very cozy and nice. Unfortunately Julie wasn't in the city during my stay but she answered all the questions I did and she made me feel like at home.
The metro and bus stations (they are in the same place) are quiet close to the house so the connection to the downtown and the airport is quiet good.
I recommend Julie's house to everyone who wants to have a nice stay in Cph :)