Jonathan was the perfect host. He was very responsive and cared about making sure we had everything we needed. The location of his duplex/penthouse was perfect. Literally in the middle of a bunch of bars/clubs/cafes/etc... It's also close to 2 different train stations (3 + 4 line) which can take you anywhere in the city very quickly. Would recommend this place!
The only warnings is that there are 4-5 flights of stairs with no elevator. The staircase inside the apartment is not suitable for young kids (no handrails). In addition, if you are very tall, be careful of hitting your head on the wooden beams in the bathroom :)
The skylights are amazing in the apartment. Thank you again Jonathan!