The difference between a wet cupboard and a wet flat is about ninety seconds, and it is almost always spent looking.
In twenty two years of plumbing the single most useful thing I have told anybody costs nothing and takes five minutes on a Saturday morning. Find out where your water turns off, and check that it actually turns.
A burst flexible hose under a sink puts out a surprising amount of water very quickly. The damage is almost never from the burst; it is from the minutes between the burst and somebody stopping it. And those minutes get spent opening cupboards, because nobody has looked before.
So go and look now, while nothing is wrong. In most flats here there is a valve on the incoming pipe, usually in the kitchen cupboard, sometimes in the bathroom, occasionally in a hatch in the corridor outside your door. There are also small isolating valves on the pipe feeding each tap and each cistern, which is the better thing to close if you can reach it, because it leaves the rest of the flat with water.
Then turn it. A valve that has not moved in eight years is quite often seized, and finding that out on the day is the worst possible moment. Turn it fully off, check a tap has stopped, and turn it back. If it will not move, or if it weeps when it does, that is a twenty minute job now and a very expensive afternoon later.
While you are there, look at the flexible hoses themselves. They have a braided steel sleeve and a rubber hose inside it, and the rubber goes first. Rust stains on the braid, a bulge, or a hose that feels stiff and hard are all worth replacing before they decide for you. They are cheap and they are the single most common cause of a flooded kitchen I have seen.
Write the location of the stopcock on a card and put it inside the cupboard door. Everybody in the house should know it, including the person who does not deal with these things, because leaks are not considerate about who is home.