The best one I feel would be New york city, because of the population density in a small area and good metro coverage. The places that you would want to visit will be not very far from a metro station.
Hi, I know that discovering a co-living, student accommodation or a PG globally is a nightmare for a lot of people as a lot of these places might not be listed on discovery platforms. I came across InstaDwell where it made it easy to find properties that are close by to where you are looking. I am sharing it here. Hope this helps for anyone who is moving abroad or moving anywhere for their education.