Another idea of ​​a tourist startup

Background:
I walked, it means that one of the many ideas hovering in the air flew home from work and it would be okay if I simply flew into one ear and flew into the other, so no. The idea is firmly in my head. And now, it seems, I know for sure that there is no particular reason to climb into the niche of tourism, unless you come up with something brilliant, new, interesting.

So what is the idea. Project for tourists, about tourists, about guides, for guides.
Functional: blogs, photo albums, search for guides, search for interesting places, ratings. True, the search is not quite ordinary guides.

Coming to an unfamiliar city, I personally always have a desire to see it. Of course, there are official guides who will show you the places that you have seen a hundred times in tourist magazines, television programs and other official sources.
But I would be interested to see the city through the eyes of its inhabitants, I want to go exactly on those rooftops in St. Petersburg, where from the point of view of indigenous St. Petersburgers the coolest kind.

How will this work?
We register on the site, then we can watch photos of places, descriptions of places from residents of certain cities. You can vote and create ratings of guides, places, cities.
Upon arrival, you can contact the person you are interested in and maybe he will show you the city.
')
Difficulties.
The ability of the project to gain critical mass. All the same for finding more interesting places you need a lot of guides.
The complexity of monetization.

Would love to hear your feedback.
Thank.