I don't believe there are unbiased sites. They are all advertisements. You don't get what you see in the pictures. Typically, they will update and restore one particular room, and show that on the website, perfectly dressed. Then when you arrive, that is not the room you get. You get one on the 4th floor, that looks nothing like that one room. The photos are sales promotions, so they can't be unbiased. Rental property company evaluations are as bad as those on TripAdvisor and AirBnb.
I recently read an article that used game theory to try to figure out what AirBnb ratings fall into two bins: the owner either gets a 1, or a 5. There are no 2's or 3's, which would mean that the place is average. Even dirty places, with animal hair on the couch, sparse hot water, lack of adequate air conditioning or heating, and the WiFi doesn't work as advertised, renters still give it a rating of 5. According to the article, the only time a place gets a 1, or terrible rating. is when the renter never saw the place, typically because the owner canceled at the last minute. The dropped renter rates them a 1 out of anger. Everyone else gets a five, no matter how bad.
What is the saying, "if everyone is unique, then no one is." If everyone apartment, hotel, or restaurant is a 5 star on TA or AirBnb, then no on is. This is why the top rated restaurant in Rome is a store that sells artificial gelato. Many more people eat in that store than eat in a top restaurant, and even though the only thing they serve besides artificial gelato is a few cookies, by sheer numbers the gelato ranks higher on TA than Michelin and other world famous roman restaurants.
I don't remember the theory exactly about why such ratings are worthless, but I think it mentioned that when rating a restaurant or a rental apartment that you choose, you are rating your wisdom, decision-making, and choices. If you rent a room at the Hilton and there is no hot water, the wifi doesn't work, you don't have to regret your choice, you just blame Hilton.
I wouldn't believe those photos, and staying near the Venice Disneyland store, or near Strada Nova, you are going to be right smack into the selfie stick taking packed, day tripper crowd.