Hi Maurits, I hope to be setting up one around 2012 Haarlem.
Also, I'm working as a software engineer at the municipality of Haarlem, and of course the city has a strong interest in LoRa (including commercial and private LoRa) for all kind of Smart Cities projects. So, if the TTN Network proves to be nice and use cases arise, I'll be pushing setting up public gateways by the city itself (not necessarily TTN Gateways, but connected to TTN).