"Living here is comfortable."
would "zai zheli shen(g?) hen shufu" technically still b gramatically correct
i learned chinese from a native speaker & this was an accepted approach to sentence structure iirc (its been about 1yr since i last practiced)
I assume you mean 在這裡生/在这里生. Yes, that is also known to the speakers.
However, you can keep it simple by saying the given translation as the focus here is to indicate the location when speaking with the native speakers.