A fantastic location right in the heart of the 17th district of Paris and right next to multiple metro stations which would allow you to get to basically anywhere in Paris. Olivier was attentive and replied to any messages quickly, especially during my first few weeks when I had some issues with the property.
Some things to note: the apartment is very high up, Olivier did warn about this but just in case you miss it, be mindful if taking large suitcases as there is no lift
If staying for a prolonged period of time, be mindful of both the drain in the shower as it can clog, and moisture in the room. I would suggest a moisture absorber and if I was to stay here again I would definitely bring or buy one of these to prevent any hassle for Olivier.
Regardless, I couldn't recommend this location enough, especially for prolonged periods of staying and the host was fantastic.