I've been to Venezia with my best friend for Easter, and the way we've been hosted at Christian's place played its part in how much we appreciated our stay.
Christian is a very friendly host, and so are his children (yes, if you're lucky, you might be welcomed by the whole family)! They're all likely to discuss with you, give advice on what to visit depending on what you like, suggest where to go and how – in other words to help in all manners!
Regarding the studio, it was frankly higher than our expectations: the pictures in the offer don't lie, it's a really cosy place, super clean, and very (very!) well equipped – they really made sure guests wouldn't need anything else.
The only point to pay attention to might be the guests registration procedure according to the Italian policy, that needs to be clarified with the hosts in advance.
Apart from that, everything was perfect, we were really pleased to be their first guests and recommend them at 100%!