I enjoyed my stay in Hotel Aviatic in Paris. It is an old, budget hotel, charmingly decorated and close to the metro. My room was beyond tiny, but I did not care as I was a single traveler and only needed a place to sleep. There floor was creaking, there was a hole in the wall, cracked floor tiles in the bathroom, and you could hardly turn in the shower, so if these things matter to you, you should find another hotel.
What mattered more for me was that the bed was comfy and that the room had a certain charm due to its shortcomings. Better ventilation would have been nice. Also, the fire alarm went off by mistake one of the mornings, but I assume that was a one-time thing.
Be sure to provide your email address to the hotel in good time, as you will need a QR code to get in after opening hours. I did not receive that, but there was thankfully someone there that could help me when I arrived an hour too late and without a QR code.
The hotel was cheap, comfortable and close to the metro. Would recommend the place for budget travelers that do not mind some imperfections.