What do I need to know before retiring in Edinburgh?

"I always describe Edinburgh as: As Boston is to New York, so is Edinburgh to London. In other words, Edinburgh is London's smaller, more genteel cousin. Most Americans would call it quaint. It's a compact city and you can walk almost anywhere. For Americans, the UK can be quite expensive. This can be exaggerated in Scotland, as they tend to pay about 10 - 15% less in salaries than in London," remarked another expat in Edinburgh, Scotland.