Location, location, location! This place was perfectly located for me, smack in the middle of the Marais. The minute you stepped out the door there were shops, cafes, bars, bakeries, etc. in this very lively area. However, because the apartment windows all face an inner courtyard, the apartment itself was very, very quiet which was important to me because I am a light sleeper.
I traveled to Paris by myself and was really happy with the space - it is accurately represented in the photographs but there are a few things you may not pick up such as there is a LOT of hanging space, shelves and drawers to put your things on and in. I had two suitcases and unpacked everything and had room to stow my suitcases out of the way. There is also a safe in the apartment, like the ones in hotels, so you can lock up your valuables when you go out. And the bathroom arrangement was perfect - one powder room with a toilet and a little sink and one shower room with a VERY roomy shower and another, larger sink - again with plenty of shelves to unpack your stuff onto.
Yes, it's two flights up but they are very picturesque, antique flights and I enjoyed walking up and down them.
Christine was extremely helpful and communicative throughout the process, has a binder with tips on where to find everything in the neighborhood and beyond as well as instruction manuals for all the appliances in the apartment, and was very friendly.
I would highly recommend this apartment and would stay here again.