Which one is the water meter of your flat ?

[NanoRay]

There are 2 meters outside each flat:

 

[cocobobo]

One is your neighbour's

 

[NanoRay]

One is your neighbour's

No, neighbor's is on the opposite site. Same structure - 2 meters.

 

[NanoRay]

I suspect it's the one furthest away from the main stem.

 

[Buckethead]

You should see your unit number on the meter.