This product is not my cup of tea; you will spend some small amount of money without getting a real useful product. I know it is only one buck. However, I would rather have paid two or even five bucks for something worth my time (and money).
The product consists of 20 pages. However, when you substract the cover page, the last page (advertisement) and the pictures, you end up with approximately half of that.
What you get is a description of what a brothel, a gaming hall and a thieves guild is. If you are interested in thieves or brothels, you could easily learn the sameby using wikipedia.
You also get two or three short adventure hooks for each of those places. However, there is nothing that you could not have come up in two minutes yourself.
Overall, I think, there are few people playing role-playing games who will be able to use this. There is nothing really useful. It is just a general description that could have been done by anyone. In my opinion, there are far superior products out there, offering real benefits for DMs. The various lists of 100 items, 100 random encounters, 100 story hooks and so on will be much more useful for anyone. Simply buying an old supplement (like "Den of Thieves" or "Simply Thieves") that deal with thieves/assassins or something similar for three or four bucks will get you far more bang for your buck!