The apartment is gorgeous, stylist, modern and well kept. The location is great too, coop (supermarket) can be reached within 5 minutes, no worries about food here, every corner you walked, there will be a restaurants/bar. Walking distance to San Marco and Rialto bridge (about 10-15 minutes walk).
If you plan to walk from Venice Santa Lucia train station, you need to pass 3 staircase bridges, which is common everywhere in Venice.
Beware, if you carry heavy or lot of luggage, consider to hire porter service (about 15-20 euro). Water bus is another option but waiting time to be on boarded is challenging if you have a lot of luggage.