I stayed in Prague 1, right next door was a bar 60k a pint, that's £2. I also found a bar just the other side of Charles Bridge that was good value.
at the airport get the 59 bus to Divorka Station, than a tram to the centre. Mustek underground station will take you close to the Marketa, then maybe a 15-20 walk from station to stadium
seniors have free public transport in Czech, but if challenged must produce ID