19-year-old boy looking for a job for in London or Amsterdam

Hi, I am 19 and I come from Italy. I can speak fluent English, German and French. I've had some working experiences but not much actually. Despite this I am very willing to work as to make some experiences during my gap year before starting university. I am currently aupairing in Germany but I will be done in April. I would like to make some experiences either in London or in Amsterdam because these two cities fascinate me and I always wanted to visit them once before taking up my bachelor. 

A friend of mine is also looking for jobs around Europe between April and July and it would be ncie if we can travl toogether, so if you need two people , here we are for you :)