I've been in psych wards a few times in the UK. Everyone's experience is different, but I found each time pretty awful. You have no privacy and no freedom. You are at the mercy of the staff and particularly the consultant. You are essentially forced to take medication that you may not want. You are treated as an idiot and as mentally incapacitated.
I have been on a few acute wards, in each case for a few months at a time. There is no treatment - no therapy and no one to talk to, the nurses are too busy. You are left alone with your thoughts and expected to get better somehow. People generally just spent all day sleeping, or smoking/vaping.
I have had some terrible consultants who have lied to me, told my parents about things I've said (I'm 30 and there was no reason to involve them), and threatened me.
The joke is, they say that going to the psych ward is to keep you safe, but it is not a safe environment. On the wards I've been on, people were always bringing in drugs, were violent, or snuck in other contraband like razor blades and lighters.
Some of the nurses were nice, but they were so rushed off their feet that there wasn't much time to talk to them. Some wards have activity workers who will take you out, do cooking or sports with you. But the second ward I was on didn't have that due to low staffing levels.
I was in the UK and in all the wards I've been on I've had my own room. Sometimes I've had my own bathroom too. Generally you are allowed phones, tablets, etc. but not anything with wires (including chargers, unless you buy a special short charging cable like I did).
If psych wards had more staff, had therapy, and had consultants with much less power, they would be better. Sorry for the ramble.