The apartment: little, lovely, cozy Parisian apartment. The exterior of the building is undergoing renovations (Frank told us this in advance), but the workers are there from 8am-ish to 5pm-ish and didn't really impact our stay. The kitchen has everything you'll need (except a bottle opener. It was the one thing we needed and couldn't find). As others have noted - the shower isn't great for tall people, but is manageable since the shower head detaches.
The location: nearby metro stops are really convenient, but we rarely had to use them since many of the major sites are within walking distance (20-30 minutes walking will get you just about anywhere). We walked the majority of our 8 day stay in Paris.
Frank: excellent host. Gave us a quick run down of the apartment when we arrived and made sure we could get in contact with him if we needed anything.
Tldr; This is a lovely, cozy Parisian apartment in an EXCELLENT location. Would recommend!