Help: Nice and central meeting location needed for Press Drinks third week of Oct (London)

Hi to all of you in London
I am looking for a venue in Central London/Downtown in order to set up a Press meeting for a one-year-company birthday and product launch for late afternoon. Style should be modern and trendy, suitable for a Internet company. Any ideas or recommendations?? People attending would be around 30 people, seperate room with projector and media facilities like Internet a must .Help is more than welcome and I am willing to share recommendations in Berlin in return!!! Thanks, Christine