We had a lovely stay at Tower Suite San Marco. They were very accommodating letting us check in early and drop off our bags while they were getting the room ready.
Grecia was very kind and gave great directions to the meeting place and also was very helpful providing a map and some recommendations.
The apartment is lovely with great views of the canal and the Campanile tower. There's a gondola pick up right below the apartment and it's a close walk to St Marks.
Would definitely recommend it to friends and family.