This is a dry collection of things to think about when designing a city, compiled by The DM from various posts to rec.games.frp.dnd.
In the early 1500s, there were
Hereford, with about 5000 people, was about 2000' E-W, and 1700' N-S. Glocester with a population of 7000, was about 3000' N-S and 3000' E-W.
In Southampton, High Street, a primary road, was about 50' wide. Secondary roads were about 20' wide. The smallest streets or alleys were about 10' wide.
Tenement houses, the poorest were about 10' wide and 15' long, usually two stories tall. When necessary another story was added when the family outgrew the original house. Ladders provided access to upper levels, not stairs.