Johannes was a great host, providing some nice snacks to welcome me and answering all queries quickly. The apartment was clean and comfortable. I was working with someone at the University of Amsterdam's Science Park, and this was a very convenient location for that, but it was also pretty easy to get other places (number 14 tram to Central Station goes from just a block away). There are some interesting things reasonably close such as Flevopark (check out the distillery in the park, a nice place for an afternoon drink with some cheese) and the Dappermarkt street market.