As other reviewers have said Roel and Jet's apartment is fabulous, beautifully designed and is in a great location, not too far to walk or get the many trams and busses to all of what Amsterdam has to offer.
Communication was great both before and during our visit, the apartment was spotlessly clean and in addition to what you see in the pictures there is an additional loo and a laundry room in the entrance hall, also a brilliant steam iron, so don't be afraid to pack your linen trousers!
When we we there - We went on the Hungry Birds walking food tour and would recommend it. Also, if you visit Anne Franks house book tickets online, they release some for the following day and we booked ours one evening for 8.40am the next day, when we arrived we just went straight to the door, avoiding the 3 hour queue around the block!