My friend and I just returned from a week stay at the Penthouse Kerkstraat rented out by the Amistad.
Bottom line is that the apartment was excellent. The location of the apartment was convenient to almost all of the destinations we frequented. Some important destinations to note, right on the same street of the apartment (Kerkstreet):
Cafe Du Klos
Chocolatier (Retail space of the Apartment building)
A few coffee shops
Also, Leidsestraat, one of the main shopping streets, is only a few hundred yards away.
The apartment itself is very cute. After climbing 4 flights of stairs (it's good exercise) you'll arrive to the penthouse. Everything seems relatively new (the building itself and the furniture). The living room area can be converted into its own room, as the couch pulls out into a nicely sized bed. There is a TV, DVD player (I don't think American DVDs work on it) along with a huge case of DVDs to play. The DVD player also plays CDs through the TV speakers. The windows facing the street open up to a very nice view of Amsterdam.
The kitchen attached to the living room is nicely equipped. We made use of the coffee machine and the fridge. Note that there is no dishwasher... use your hands!
There is a powder room (toilet and sink) adjacent to the living room. Next to it is the bathroom (sink and shower) that is pretty spacious. There were plenty of clean towels ready to use.
The bedroom comes with a nice queen size bed with convenient built-in side tables. There is a wardobe and dresser that should easily accomodate 2 week's worth of clothes. Also, there is another TV and DVD player in the room. The balcony is attached to the bedroom, and it's pretty damn nice. The view is beautiful and there is room for two people to sit and enjoy a smoke (or whatever).
The ONLY serious problem I had was with the fact that I had to pay in cash. I was not made aware of this condition until days before my trip... so I had to make a mad dash to get enough Euros to pay them (I was planning on charging it to my credit card). Apparently, someone owns this apartment and Amistad rents it out. Amistad asks for cash so that they can directly hand over the money to the owners. Is it me, or does it seem like Amistad should go through the trouble of giving the apartment owners cash instead of their guests? Anyway, that's my big complaint.
Otherwise, the staff seemed friendly. We were never awake to catch breakfast at the Amistad, but the room they offered it in seemed too tight anyway.
Anyway, I hope this helps out!