We had a fantastic stay here during our 4-day trip to Venice. The location is absolutely perfect - it's an easy few minutes' walk from Piazzale Roma, meaning you don't need to hump your luggage half way across town after travelling from the airport. Being on the ground floor of the apartment building also helps with this!
The size of the apartment is very good and not cramped, and it was very comfortable to live and sleep in. It has all the facilities you will need during your stay, including heating and air conditioning, and excellent wifi. Mario was extremely helpful and communicative throughout the whole process, and the check-in process was thorough and excellent.
Our only slight complaint would be the lack of sound-proofing and the fact that you hear a lot from the adjacent apartments, and outside. This is only really a problem during waking hours, however. Although the Venecians do appear to enjoy their early starts, so don't go expecting too much of a lie-in if you're a light sleeper.
An excellent place to stay and wholeheartedly recommended for an easy trip to Venice!