In the first photo, look for the Hotel Monaco &
Grand Canal in the lower left corner of the frame. From the hotel,
you can walk a block up the Calle Vallaresso, turn right, and enter
the Piazza San Marco.
The second picture shows the hotel and its
courtyard, which are just to the west of the San Marco Giardini boat
waterbus, airport-boat, and gondola piers. (Click on the building to
zoom in and read the name "Monaco & Grand Canal" on the façade.)