score:3
A 7-day-ticket is 30 to 37 Euro, depending on the area. Going for zone ABC rather than AB would pay for itself if you travel into C once or twice.
Depending on the exact timeline, four day tickets plus a single ticket on Friday might be cheaper, but the savings are marginal.
This includes no museum admittances, but I don't know what you want to visit and how often. Last time I checked, not all Museums were included.