Your timing needs to be considered. Apparently at this time of the year (late September) San Marco square is liable to flooding (around 11.30 am) and so suddenly the “skip the line” entrance was closed. By the time it was relocated there was a long very long “skip the line”. The square can be impassible at these times

Meeting place was not as indicated via the "Meeting Place" GPS - was on other side of Square, however they did have a sign and called (after standing in the wrong line twice). Had to exchange the online voucher for a real ticket. You must be online (so you can click the link) as the PDF does not have all the tour info needed. Tour was very good, however would have like to finish with even an unguided (just given access) to the balcony areas.

Met with the guide in museum corner as directed for the 11.50 tour. Then taken through the square where we met with another guide, to get our radio headsets. We then waited until 12.30 before we were taken into the Basilica! The guide was very informative and gave a great history of the building and the stories behind the artistry. The tour lasted less than an hour. We were given the option at the end of going to see some glass blowing or to go upstairs to the rooftop of the Basilica which we chose to do at an extra €5 each. This gave a birds eye view of St Marks Sq. and put across the lagoon.