One of my nieces and a friend of our daughter studied in London. One of them didn't even have a window in her room and she still paid more than 400 Pounds a month.
£400 is 560 euro.
A London resident will need to pay council tax (about £900 per year for the property) and transport (who knows; about £200 per month for zones 1-5).
Just to clarify a couple of things:
350€ is about £250
£400 won't get you a tiny one-room apartment without windows, that would be amazing! It'll get you a tiny windowless room, in a pretty grim house shared with 3 or 4 (or 5, or 6) other people, in an awful or really out-in-the-sticks location. (You can optimise by substituting some of the factors, but any way you slice it, a £400 room anywhere in Greater London is not going to be good).
Probably the baseline for a studio apartment (I've never seriously looked so could be a bit off) is £800-£900 per month for anywhere resembling a decent location.
yes, they lived in rooms, not appartements indeed.
Going back to 2002 my first flat was a place under a betting shop in Islington and had a door that we couldn't open and had no idea where it went to and that was £600/month. Oh and it smelled of piss and shit.
Though not having a window is illegal
In most other outer boroughs, getting home after midnight is either very expensive (taxi/minicab, including Uber) or very slow (two or more night buses). Most people I know -- in their 20s -- prefer a shared house closer to the centre.
All this will change in September, when (if?) the night tube starts running on Friday and Saturday nights.
[1] https://tfl.gov.uk/cdn/static/cms/documents/tube-dlr-lo-adul...
If the tube ran at night, I could reasonably stay out late in Zone 4+! I can't remember the last time I did that. (Why might I want to? Because people live there, and have BBQs etc.)
It sums up the absurdity of the situation when it's genuinely and routinely proposed that a solution to ridiculous cost of living in a city is to live.. not in the city.