Maddalena and Valentina's place marries location and affordability: it is roughly 18 minutes walk away from San Marco and is very close to the Giardini and Arsenale locations of the Biennale, which is why I visited Venice with 3 other friends to begin with. The flat was sparkling clean and the main bed was incredibly comfortable; it is overall a small flat for four people, but it's very nice and we were all very happy with it. Recommended!