We would definitely recommend Julien's studio. He had a fantastic stay there, and would love to come back.
The room is gorgeous, absolutely lovely! The bed is remarkably comfortable, and the shower just fantastic - you won't want to leave.
The building was very quiet, and felt very safe.
The neighbourhood might look unsafe to people not familiar with the area, but it wasn't unsafe at all! It's very lively and busy, 3 minutes walk from 2 stations, and we had no issues at all.
Julien had left several helpful information and recommendations, maps, transport info, restaurant leaflets, and more. He was also available for us to speak on call or messages, and ask questions and recommendations. An absolutely amazing host!
We had an amazing time overall, and enjoyed the room as much as Paris in general. Don't miss the opportunity to stay at Julien's :)