This is a great place to stay - I would definitely recommend it. We were a group of 7 people and there was plenty of room for all of us across the two flats. It's very easy to walk between the 7th and 10th floors using the stairs or to take the lift, so we didn't feel far away from each other.
The flats are just as pictured and described: very clean, beautifully decorated with lots of plants and Claire's wonderful artwork all over the walls. They feel very welcoming and are full of character. The views, from the 10th floor in particular, are stunning, especially at night.
The location was convenient - 15 minutes walk from Old Street tube station. Check-in was easy and Claire's communication throughout was friendly and efficient.