This is my second stay in 6 months, with a 3 visit already booked in - for the price of the listing, the location alone is worth the money. It's a few hundred meters from Notre Dame, Sainte Chapelle on the Île de la Cité, and if you head off in any direction for a 30min walk, you'll find spectular buildings and things to do.
The building is not the biggest place, but it's no smaller than some hotel rooms, and for the price, you get the convenience of a kitchen, a space to relax and make home for a few days.
As a solo traveller or as a couple who travel lite, it's perfect, I couldn't recommend this enough.