Hi Yin and thank you for your review. To clarify a few points. The space has never been a garage. We have lived here for 12 years and prior to that our understanding was the space was used by a local florist for her business. The door at the front designed by our architect was to give the impression of a "Mews house" to create the impression of a (Chelsea) studio space and is double glazed - the floor is at least 12cm from the ground so a car cannot be driven into the area; at least not without great difficulty.
Yes, the main property does back onto a underground railway line but the Studio has a separate private, fenced garden and is not, directly connected to the railway - there is a distance of 4m. However, we take privacy seriously so will look at what else we can do with introducing trees or screening; so point noted.
We are sorry that you were surprised, but as our reviewers have noted it is a studio space, a "tranquil space" and is described in accordance with their feedback and previous rating of 4.8.