We stayed at Frank's while attending a conference at the University of Amsterdam. It was an easy commute by tram to both the university and Central Station. I'd highly recommend staying at Frank's -- it's a great location, being close to everything but also far enough outside the city center that you get a chance to escape the crowds. We appreciated that Frank allowed us to check in a little early and that he had a lot of great tips for what attractions to check out during our visit in Amsterdam. We will definitely stay again if we visit Amsterdam in the future.