Thanks for the kind words! We’re happy to answer questions about the game as they come up, and we’ll try to check in here regularly.
We did want to talk a little bit about the grid style. We’ve actually avoided doing a street-by-street geographic reproduction of the city; instead, the boroughs that are built – we’ve covered a little over half of the thirty-two-plus-one so far, as @Evilgrayson mentioned – are abstracted into regions that get represented on the grid as rooms. “Battersea,” for example, is a single room (one of a half-dozen that make up all of Wandsworth), and RP-able spaces in Battersea (like the Power Station, and sometimes individual neighborhoods when warranted) are linked off it.
So, when you want to go from the Oxford and Cambridge Club to Harrods and don’t want to use +hangout/jump, you don’t go along Pall Mall to St James’ Street to Piccadilly to the A4 to the Brompton Road to Harrods: you just go from St James’ to Knightsbridge to Harrods. The idea is to make London navigable from the sort of high level view you get from, e.g., Google Maps, rather than requiring knowledge of the city and its streets and landmarks.
Additionally, boroughs become more abstracted (get fewer rooms) the further they are from the city center. e.g., Hillingdon – though the second largest borough by land area – has half the rooms that Westminster does. Because Westminster has a lot more of what people think of as “London” in it than Hillingdon does.
The great majority of what’s built is restaurants, clubs, museums, etc. – things that get cataloged in +hangouts. We love poking around grids and we’ve put some surprises in for people who do, but you can get by just fine never using anything but +hangout/jump and +meet.
As far as an in-game map, stay tuned! We’re looking at how we can provide something that’s helpful but not overwhelming.