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[efthimios]

While I have avoided staying in any, I did have a look at prices a couple of months ago. Get ready to spend at least 50 quid for a hotel, unless it is very eh interesting hotel or far from anywhere.
If you are going to stay just for a night or two, you might have better luck (money) to find a bed and breakfast place, it should be 10-20 quid cheaper.
also, I don't know how things are in Germany (you are german, right?) but two things that might be of help are, 1) unless you ask for it (in a cheap hotel or b&b) you will have a bathroom/toilet shared with the other guests. 2) There are 2 different taps for water, one cold one hot, you can't mix them. (though I guess in some hotels that might be different) I always find it annoying and still not used to not being able to have water at the right temperature. I end up moving my hands quickly from cold to hot water to get it at warm LOL. (this I will never figure out on my own about this country)

In general hotels etc are clean and the people polite and helpful.
Taxis in London are expensive, so be prepared to pay 15 quid for a 10 min drive or so.