This is the perfect Old Town location. You are close to the Royal Mile, plenty of HP sites, and the train station, uni, and shopping centre are a short walk. The flat offers all the essentials and the hosts are super responsive. I did not note a down allergy when I made my reservation and when I reached out to the hosts, non-down bedding was delivered straight away.
The smell of cigarette smoke from the flat downstairs does come up…you can open windows to help with this. We were using this as a base and out and about most the day, so weren’t around for this to be a huge problem.