That would be hard for me to say as I make a point of living as close to local prices as I can. Currently I spent €250 per month (or €58 per week) on rent and all bills (water, electricity, etc.) Then I spend around €200 a month (~€47 a week) on groceries.. But I would want to get my own groceries and take care of my own food as I'm a vegetarian and I like to eat when I feel like it (I'm very adverse to scheduling). I'm about to move somewhere where I'm going to spend more on my rent - €340 a month (about €80 a week), but it's very, very nice and I will no longer need to rent a desk in a co-working office. That's the upper range of my normal budget. If I'm going to splurge, I can go up to €700 a month (€163 a week), but when I do that I can't do anything else (other than buy my groceries and even there I have to be careful), so it makes life pretty miserable.
I would have been a nomad anyway, but I should point out that one of the reasons I left home (the UK) was that I simply could not afford to live there. I'm a creative - as in a creative in the literature industry, not marketing (which is far more lucrative) - so my income is not great and life can be precarious at times!