We had seven young adults stay here in early January. We had three different rooms. They let us check in before 10:00 AM in the morning at no extra charge. All were clean and comfy. The concierge was very helpful with all aspects of our stay. The FULL European breakfast was outstanding. Highly recommended. Please note, I gave this hotel an "Excellent" because it is far away from the tourist scene - which gets old very quickly in Venice.
If you're arriving by airport with a group, I would highly recommend getting a water taxi at the airport. You should be able to negotiate the price down. Tell them the hotel and they'll drop you off so that you only have a one minute walk to the front door. On the way back to the airport, we had the concierge schedule a pick up for us and paid €120 for the seven of us. If you use the train station, you have about a 1 hour 25 minute walk through crowded streets and over bridges. This might be fine for a young couple, but not for a medium to large group.