I decided to study English at EC Covent Garden, because they have a special class for people over 30 years of age.
I met a lot of people of different nationalities and backgrounds and the atmosphere of the classes is calm and suitable for adults.
The teachers and staff here are friendly and helpful. I used to have lunch at the nice café in the school and they offer a variety of excellent social programmes after class and over the weekend, so I could get ample opportunities to be exposed to English.
I would like to recommend EC for a great experience in London even if you have just one week!!!