Excited about Hanoi, Advice Appreciated!

Hi outandaboutnw,
Welcome on board

I think the https://www.expat.community in Hanoi is well spread out across the city these days.
IMO, for the first couple of weeks you better stay in the West Lake (Ho Tay) area. It's a very expat friendly area and you can easily connect with many resident expats.

The Old Quarters (around Hoan Kiem lake) is a tourist hotspot. The streets around Hoan Kiem are now for pedestrians only. Take an evening stroll to explore the alleyways in that area.
Don't forget to do a bit of friendly haggling if you want to buy some souvenirs etc.

Wherever you go there is always a Bia Hoi just around the corner. These places are always crowded in the evening with locals and expats. Good place to meet people and socialize.

As you plan to travel around SE Asia, I'd suggest you carry with you some good quality face-masks. Air pollution in Hanoi (and in many other cities in SE Asia) is high.
While in Hanoi, just try to avoid congested areas in rush hours. You'll be fine.

Please take your time to browse through all the threads on our Hanoi forum to know more about life in Hanoi.

Welcome to Vietnam!   
Cheers!