Sorry, what's the revolutionizing about this? Not do disappoint you but my mother already has a cart with those 3 tiny wheels and she uses it to buy groceries every day. In fact she bought it at least 3 years ago.
In terms of connectivity and living expenses three are more or less equal.
As an Uruguayan I would say that Montevideo is nice, but there is not much natural beauty around, the same for Buenos Aires, but Santiago is in the foot of the Andes, so in that it has more to see.
Also Montevideo is quieter than Buenos Aires but Santiago is much more well organized than both. And the only one that don't have a metro train system, so the public transport consists only on buses that get quite crowded on rush hours.
The issue here is that the internet consist basically in monopolies. Its even more alarming when you consider that many of those monopolies are in the hands of just one company. (Google)
This article confuses civilization with culture, you probably can't have the first without the latter. but culture by itself won't do great public works, wont even develop a written language.
Civilization means cohesion to a greater level than a mere culture.
Hehe yes, I didn't remember the term in english, in my country a pension gives you a bed sometimes shared and sometimes on a private room but no food, but they have a kitchen where you can cook.
Anyways from what the OP describes his business is much more intensive and involved with his guests.