We are going to be in Vienna next April for a week, and have never been to the city before. From a quick google of self-catering apartments, the city centre (inner stadt) appears to be twice the price of everywhere else. So we (me, DH, 17 year old DS) are looking for advice on areas to target. We don't mind walking into the tourist areas or a short tram/underground ride. Somewhere easy to get to from the airport/station would be good too as we're planning a day in Bratislava too.