It's easy to sign up - once configured, your official physical address on all invoices and government papers becomes a c/o address in Stockholm. In other words if you somehow need to document our address to any authority it's no longer possible. Should you then choose to try and revert to your actual physical address it becomes impossible and you will be left without at address in any official register at the Swedish authorities. I can only recommend to stay far away from this app!!! Update - Still working on getting my physical address back....