I just booked the Bohemian Higlights tour with Trafalgar (travels to Germany, Austria, Hungary, Poland, Czech Republic). . If you want to know how central hotels are, go to
www.tripadvisor.com and enter the hotel name. They have ratings and reviews for all the hotels. In general none of the hotels in this tour are very central. Most are what Trafalgar classifies as "downtown" or "midtown." Reviews on tripadvisor.com will normally comment on how central the hotel is. You can also go to expedia.ca (and look up the hotel) or the hotel website and it will tell you how many km/miles it is located from main attractions. Being central/downtown is not always a good thing - hotels can be more run-down and in sketchy areas (e.g., many parts of downtown Frankfurt). . I went on the European Marvel with Trafalgar last year and none of the hotels were that central - but they all had public transportation nearby so I had no problem getting around with bus and/or subway.