This place is unique and charming and in a really wonderful location in Vieux Lyon. Overall, we liked it and it suited us fine. We do wish the apartment had been left better stocked for our 4 day stay (no hand soap, no hand towels, only 2 rolls of toilet paper, only 2 Nespresso pods, somewhat dirty dishes, etc.).
Also, because this building is very old, in addition to the charm, there are features of this apartment that guests should be aware of.
The ceiling is very low in many places (I am 5'2" and had to duck to access the fridge for example).
The toilet is in a funny location, it didn't bother us but be mindful that you do need to be careful not to fall down the stairs when you enter/exit.
There are over 100 steps to get up from street level up to the apartment. If you are not in good shape, this will be difficult for you.
Don't let these things deter you from booking if you can handle those unique features. It is decent value, great location, and if you are spending most of your time exploring Lyon anyway, you will be just fine!