They were the most known britpop band of Hungary, active from 1997. I listened to them and attended maybe one concert during high school in their early years. They had some countrywide known hits in the early 00s, and one song played by MTV but never a breaktrough and have parted ways and abandoned the band last year.
The band name was supposedly made on a house party, in no. 7 of some street I do not remember and the singer claimed this party is so good that this is heaven street -> hence heaven street seven.
It remembered something of Travis, Interpol and Old Radiohead (before Kid A and Amnesiac)