We ended up to a totally different apartment, which we had booked. We only heard about the change after landing to Amsterdam. So, not really much to do, but accept the offer. There were some minor deficiencies in the new location (one missing bed and linens) and it was in a bit noisier neighborhood as the original place, but other than that all worked ok. The alternative place was clean and spacious enough for 5 people and it was in a nice location. Communication with Dries was smooth all the way.