Pros: Location, location, location! And, it's a cool building.
Cons:
(1) Bad check-in experience (I advised that I was running 15 minutes late because of traffic, but the check-in employee wasn't there. I had to text him twice more to find out when he would return to let me in)
(2) After making the (non-refundable) reservation, the confirmation email included: "We wish to inform you that during your stay, you will not find in the apartment the necessary cleaning products and toiletries. However for your comfort and facilitate your stay we suggest you: A cleaning kit with: Sponges, various detergent, dishwasher tablets, washing machine tablets, garbage bags. The rate for the cleaning kit is 13€." Not cool.
(3) After entering through the locked front gate, the unit is reached through a rather long interior alleyway, 2/3 of which is completely pitch dark at night. I'm a big guy, but I still felt a bit uneasy.
(4) Far less important, but the only window is the large one surrounding the front door, which makes the unit feel rather dark. Fine if you're only sleeping there, but not an inviting daytime space.