Still working on it, but....
The guild is in a large city. There are a few small parks in the city, but mostly it's just a lot of buildings. The city itself is in a mostly flat plain, with some farmland nearby, and a large forest, with several main highways leading out to other cities. The city's population is around 50,000 people living within the city walls, with about another 10,000 living in the nearby area.
There are two other guild branches in nearby small towns, each with a population of around 300, which are connected to the main guild house via teleportation runes. Guild members are free to use them as necessary, and it's not uncommon for people in the small towns to come to the branch and ask a group to teleport out to help. Your guild is the only guild in those towns, but there's four other major guilds in the large city, and a dozen or so smaller guilds.
I'll plan out more about the area in a bit.