I sent an email to the hotel asking about Wifi without reading this forum first.
I found out that the hotel offers Wifi service but it is a pay for service and it is supplied by T-com type "hotspot". So if people want to pay for this Wifi it will be there in addition to the Eurofurence offering I think unless organisers have different information. So this means two services will be available. I couldnt reply to the Wlan thread as it is locked but this probably belongs there. This should mean people can eaither use the eurofurence free wifi or paid for through the hotel via T-com. Hope this information is of use.