Location is the Unperfekthaus. The website can be switched to english, so take a look. We are in room 154 there and we may also have a dedicated extra room for extra sessions as well as reserved cafeteria area.
Next to the Unperfekthaus is the mall Limbecker Platz as well as the central shopping streets of Essen. There are a few central hotels nearby. My preference is the Holiday Inn Hotel Essen City Centre, but there are other good locations. You can easily walk from the main station to the conference location and this hotel.
We already got first registrations, so we know that people from four European countries will be there. With those visitors and three english only speakers on our list currently, we may turn to do everything in english. But we'll see.
Registration is open. Schedule should be only later this week: realsoftware.de/events/realcon2011essen