London: This July I spent one week in London.

It was the first time I visited this city and it was a great experience.
I met the city exactly like I imagined it: full of tourists, chaotic, weird weather (not ugly, but could change from wonderful to ugly in just a few minutes), cool old buildings and typical British people :).

I like the underground tube system in London. It is cheap and you come around very fast.

While I was in London, I tried to use every minute of my time there. So I have been running around the whole week. When I was back home in Switzerland, I was happy to get some sleep and do nothing before I went back to work.;D

I am looking forward to visiting London soon again!

London <3

This past July I spent one week in London.

It was the first time I visited this city and it was a great experience.
I found the city exactly how I imagined it to be: chaotic, full of tourists, weird weather (not just ugly, but changing from wonderful to ugly in just a few minutes), cool old buildings and typical British people. :) 

I like the underground system in London. It is cheap and you get around very fast. 

Funny, I feel the same way. :) However, most locals say they hate it.

While I was in London, I tried to make use of every minute of my time there. So I have been was running around the whole week. When I got back home to Switzerland, I was happy to sleep and doing nothing before I went back to work. ;D 

"I have been..." means up to this moment now. Yet your London experience is past and finished, so use the simple past form.

I look forward to visiting London again soon! 

Great! Glad you enjoyed it.