Alex's place is at a great location, right next to a handful of metro stations that will take you anywhere around Paris.
The apartment is situated in a rather old, yet well-maintained, secured and clean building.
It's nicely decorated, yet the furniture must be old as it is mostly worn out. The place could be cleaner and more well-equipped, as there were only towels, a roll of toilet paper, hand soap and shampoo in the bathroom, which was extremely small. And very importantly, there was nowhere to hang the towels to dry, which was very annoying.
The room is not as small as it looks in the pictures, but we only had two cabin bags, so bigger luggage might take more valuable space.
Alex was very welcoming and easy to reach.
The neighborhood is great, with nice places to eat down rue Montmartre and rue Montorgueil, which are less than 10' walking distance.