Yes it is possible to use an ng1 service in an Angular 2 component.
To avoid conflicts with the angular 2 router you need to write an url handling strategy. Just extend the ng1-ng2-url-handling-strategy.ts file in my upgrade module for your application purposes.
Btw there is an angular 2 ui-router implementation: https://ui-router.github.io/ng2/
I added them into the corresponding sections i.e. login.html belongs to the login folder where login.service or other login related stuff goes to, as i described above about the layer application by feature/component.