OMG! You have exolored Hanoi this much within a day... What can I say about this than to say you are just too awesome... Lol
Their is no perfect place all over the world, but if you feel welcomed and accepted in a place, I think that's the best place for you to be.
Before a week, you would have know everything about Hanoi, and by then you would have gotten answers to most of the cons too....ahhahahah
Hope your doggo is enjoying herself despite no any other of her kind yet on the streets?