I would like to suggest JSC Travel agency, an online travel agency in Prague. I was very satisfied with the kind help before and during my stay in a Prague hostel that they run.
The service included online reservation for accommodation. They just took my credit card number as a guarantee for the reservation. No payment before, no stressed nights.
The office is at the hotel Extol Inn, Pristavni str. 2, Prague 7, close to the railway and metro station Nadrazi Holesovice.
Try www.travelinczech.com or www.czechhotels.net
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