Plumbing Questions? Ask a Plumber for Answers ASAP
It's very likely to be water hammer.Water regulations require the installation of a non-return valve, to prevent backflow, but these are sometimes absent, and other times they fail. Even when working, these aren't designed to prevent movement in pipes that aren't clipped properly, but they help. Another device that helps is a "shock arrestor". An example of one is here:https://www.screwfix.com/p/reflex-expansion-vessel-shock-arrestor-0-16ltr/8199vAs you can see, they're not expensive. Installation is very easy, for a plumber. If you obtain a quote from a local plumber to install one of these, and present it to your landlord, he might be persuaded by the modest price to have it installed in his/your property.. If that reduces your problem, you might then be able to help your neighbour persuade their landlord to install one in their property.
Yes that's certainly a shiny new stop cock, but I can't see any NRV anywhere. There's enough room in that cupboard to have both a NRV and a shock arrestor.