Antonia was an amazing host! We arrived at 2pm and she was there to welcome us with a cup of tea :-) Even though she was really busy with her studies, she managed to talk to us every evening so that we can say what we had done during the day. She made us feel like we were at home! The apartment is lovely and well situated. Biba is so cute and very dynamic! This place is recommended if you come by car (car park is included), the underground is just 4 minutes walk from Antonia's place. And a 10 minute ride will bring you to Westminster.
Do not hesitate to go there!