Rene and Ellen have a great little apartment. It's incredibly clean and well equipped. The bed was super comfy as well. The Wifi is not great, but we didn't go away for the weekend in order to the glued to the Internet.
Whilst the apartment is in The North, do not be put off by this. Access to the more touristy part of Amsterdam is incredibly easy by a number of different means.
We'd definitely consider using their apartment the next time we visit the city.