Sorry to be the naysayer, but consider the garden carefully. If it works for you then that's great, but a 5 bed house will often be bought by families with children who might often be put off by such a small garden. Whilst it's not a issue for you, it may impact your ability to resell in the future.
The garden faces East and is surrounded by buildings so will likely get very limited sun (if at all). Next door's balcony and the house next to that's extension combined with the flats immediately behind mean the garden appears quite overlooked, so will potentially result in a lack of privacy.
As far as the structure it's-self goes - looks lovely :)