The closest mainline station is Chiswick: get there from Waterloo or Vauxhall and its a 5 minute walk to the boat house.
The closest under/overground station is Gunnersbury: District Line from Victoria/Embankment and Overground services from Camden road
Buses: The 27 bus goes from Warren St to Turnham Green and back for if you’re ever coming back when the tube has stopped!