I booked the Mansion for a weekend away with 15 friends.
While it slept all of us (in fact the bedrooms were quite nice, with good showers and were clean) and the flat is very central, the communal areas are really quite poor. There is not a living room as the listing says, and the kitchen is a small corridor with very little space to prepare food. The only communal area is a slightly strange windowless dining room, with a sink and hairdryer in it.
The main issue we had was with the temperature regulation in The Mansion. It was a problem from the moment we arrived until we left on Sunday morning.
Two of the rooms were far too hot (both around 26- 27 degrees), and one had no working heating whatsoever, making it quite chilly. Both of the 'hot' rooms had big sliding doors that would have provided some welcome air flow and relief, however the doors were locked and no one from the management company would initially open them, citing council regulations (I'm not sure around what). This was a concern not only due to the excessive heating but also in terms of having a valid fire escape, as this left only the front door at the top floor of the property as a way out.
I had to make several phone calls and deal with many different people both on the phone and in person to try to get this sorted, but the heating system never fully regulated over the whole weekend.
At 11pm Friday night (at which time I really should have been relaxing and enjoying the long-anticipated celebration with my friends) we were able to get some relief by begging one of the managers to come and unlock the patio door in the room above the kitchen as he agreed it was unacceptably hot; but without my persistence nothing would have been done, AND this still did not solve the issue throughout the whole house.
Other small issues we had were sorted relatively promptly (e.g. despite confirming that we planned to cook on Friday night, the house did not contain enough cutlery, water or wine glasses for all of us), and would not on their own be cause for complaint, but the heating was a real source of stress and annoyance for us over the weekend.
In Amsterdam it's quite a unique property to be able to sleep 16, but I feel frustrated that I had to spend so much of my time, energy and phone bill attempting to sort a big issue that I believe the managers were aware of beforehand, as there were fans and blow heaters in the respective bedrooms already.
All in all we were happy to be together but the Mansion - somewhere we had looked forward to being for months - was a disappointment.