David's place has an ideal location and David seems like a great guy.
The location is on a very old square in the heart of Vieux Lyon, the oldest part of the city. It is surrounded by restaurants, bars, shops, and many other points of interest within a few meters of the front door. The right bank of the Saone is just a few steps away. The upside of this is that it's an exciting place to be and there is a lot to do almost all the time. The downside is that it can get noisy. The flat has no air conditioning, which didn't really impact our comfort, but does mean that if it's warm, you need the windows open, which lets in the noise. The only other issue with the location is that it's a little far from public transport, but this doesn't seem to be much of a bother.
As for the flat, it is on the 2nd floor (3rd, to an American) of a very old building, with a spiral stairway. If you are challenged by stairs, or if you are expecting a pristine hotel-like experience, this might not be the place for you. On the other hand, if you like a sort of quirky old place with lots of character and want to be in the middle of the action, the you will probably find David's place ideal.