The place itself was fine - tastefully furnished and decorated, reasonably
clean and much more quiet than you‘d expect from the (slightly dodgy) area. We also appreciated the green space outside the window. The location is convenient for the Gare du Nord.
However, communication was a mess. The owner relies heavily on generic, pre-scheduled messages. So you will receive a prompt to fill in a form you have already filled in, receive a message at 4 in the morning, etc. Sometimes the owner messages you himself, sometimes it‘s a concierge service he apparently works with. Some of the info was inaccurate, some of it arrived later than you would need it, and some of it (like check-out procedure) was sent in two different versions that completely contradicted each other. All in all, a needlessly stressful experience.
This could easily be solved (clearly communicate the essentials before, then follow up with a pdf or even a physical folder in the flat on check-in day). But right now, it puts the burden of sorting through all this mess on the guest. So next time, I would book somewhere else to avoid the hassle.