I've just returned from an absolutely amazing trip with Euroventure and cannot fault them! It was our first time interrailing and yet all of the trains and transfers were sorted for us and were so easy to catch. The hostels were all super friendly and cosy with great bars and cheap breakfasts, most of them were in really good central locations surrounded by many places to eat and other young people and those that weren't were also no problem as the public transport was easy to use and was reachable only 2 minutes away from the hostel doors. The only improvement I can think of would be to add the direction of the trams/metro in the directions to the hostel rather than just the stop we needed to get off at as we did manage to get on the right tram going the wrong way in Vienna-luckily only once! Other than that minor difficulty I highly enjoyed my holiday and would book with Euroventure again!