This is a wonderful place to stay in Paris! I highly recommend it and would definitely stay here again. The apartment is very centrally located and you can walk pretty much anywhere from here. There are also several metro and bus stops close by, so you never have to go too far to connect to other parts of the city.
The apartment itself is fantastic--clean, a lot of natural light, cool art, and on a quiet street. I was surprised at how little street noise there was given how busy of an area this is. The bed is also super comfortable. By far the most comfortable pull-out bed I've slept on and it feels just like a regular bed, but with the convenience of converting back into a couch if you want the extra space. The four things I was really looking for in an apartment were central location, comfortable bed, quiet at night, and natural light; this apartment apartment has all of these things! The space feels like someone's apartment as opposed to a generic hotel room, which I liked--it made my week in Paris feel like a much more local experience.
I didn't end up meeting Alfred in person, but he was always very responsive and helpful. He provided very clear instructions on where to find keys, how to get into the apartment, etc. and was proactive about checking-in to see if I needed anything.