I have a collection of these, it gives an overview of the main city center close-up and has a few main attractions located on it, and a larger version of the city, with tube map on the back. Don't rely on this map, go and do research if you're planning on going. We used it as a brief reference of where things were. In reality, there's so many small streets that all look the same. Go to your hotel and get an A3 (free) Mini-Cards map, they have free offers for tourists on the map too.
Perfect size for popping in your bag. We used the Lonely Planet guide to decide where we wanted to go, then marked the locations on this map. Became difficult to fold it back towards the end of our stay though.
the map is very useful but the folding is a bit cumbersome if you accidentally misfold - if it loses its shape, then you may as well fold as you would a piece of normal paper! overall, ok and useful mini-map