how to get to the eiffel tower from 7 rue de port aux vins

This is the route I would say is the simplest from Google Maps. But it involves a fair amount of walking.  Unfortunately Bois de Boulogne is right in between these two addresses so there's no real direct route between them and all options require at least a transfer if not two.  Keep in mind that transfers from Bus or Tram to trains (like RER or Metro) is not included on single-use tickets.  If you're using a pass like Navigo Week pass, this isn't an issue.