Our group of 9 guys had a great time in the Liverpool Terrace apartment, staying from wednesday - sunday. It was well suited for 9 people. More than 9 it will be crowded, but still doable. The outside terrace was great for setting up breakfast before starting our day activities, or having a drink in the afternoon before going out for dinner.
The help and service from the host was great at all times! I would do another stay for sure.