Nikos' place was fantastic. It was right in the city center, very short walking distance to all the major tourist attractions in Venice. It was very convenient to be able to pick up the keys at the hotel around the corner, since they have a 24-hour desk, and I got in really late at night.
The unit is older (as are all apartments in Venice), but the fixtures and appliances were all new and worked well. The shower was great. The apartment was spotlessly clean. It was also huge, much bigger than I expected. There are two, pretty spacious bedrooms, a small kitchen, decent-sized bathroom, and a good-sized living area with a dining table, couch, and TV.
My only (minor) complaint is that the bed in the master bedroom wasn't very comfortable, but it was fine for a few days. I would definitely stay at Nikos' place again if I were coming back to Venice and needed a place that size.