We haven't met with the neighbours to find out how they are? Is it something that people do while considering buying a property? Is it normal for us to go and meet the potential neighbours, or is it considered rude/ weird?
It is a bit weird, but whenever I view a house that I'm seriously considering in an area, I usually find someone near the house who is walking a dog, cleaning a drive, that sort of thing, and ask them what the area is like.
I've had invaluable information about parts of roads subsiding from these chats.
The problem with knocking on the immediate next door neighbours houses is: THEY could be the problem neighbours!
When you go for second viewings, you should ask whether there have been any neighbour disputes, whether informal (e.g. arguments) or formal - which are usually documented and logged, such as disputes over planning applications, complaints over noise, etc.
You can also use this:
https://www.adt.co.uk/crime-in-my-area
You can zoom in on your potential street to look at crime.
Once, using this, I asked a seller why there were 6 incidents on his road, seemingly the same house within the last 6 months, and after looking baffled for a moment, he told me the next door neighbour but one regularly beat his wife up.
So, obviously, I was never going to move there. But that ADT tool is invaluable. Just be careful not to be scared at the 'crime within 1 mile' figures and zone in more into your road/the roads you are most likely going to need to walk down.