An absolutely delightful stay, the flat is exactly as described, calm and spacious with high ceilings and easy access throughout. The street outside does get a little noisy from time to time, but that's only to be expected when you're right in the centre of town, and the double layer windows make it easy to shut out. Its worth saying that all the beds are in the same room, which wasn't an issue for us but might be for some.
The owners are super helpful and responsive, and access to the apartment was really easy.