Sisi's place is a great location and a truly unique experience. We enjoyed the Parisian feel and that we were right in the heart of the city with many options and experiences. We are short in height and so the sloped ceiling of the loft and the small toilet door suited us. Sisi was very lovely and communicative. She greeted us kindly and checked in on us to make sure we had the best experience. Our friends also joined us for our final night.
One point to note - as described, this is a loft. Therefore there are flights of stairs (no lift) to get to the top with additional stairs in the apartment itself. Suitcases will need to be carried up which may not suit large luggage. It was completely fine for us and we expected this.