I highly recommend bateau Friponne if you are looking for a cool place to stay in Lyon. Easy to get to from Part Dieu by the T1 tram, it is quiet overnight and a pleasant walk to the historic old town. The hosts are very welcoming and helpful. The space is clean and well appointed, although tall people should watch their heads as the ceilings are low, as one would expect on a once-working boat.
Thanks Christian and David!