I used this for a one day quick stop tour of Budapest. I have relatives in Hungary and wanted to travel into Budapest alone whilst I was staying over to see what there was to see.
I bought this guide before I left as it looked extraordinarily feature packed and very functional for the type of trip I planned.
The AA guide has an excellent top 10 places to see and whilst you can't do all of them in a day (unless you race around which is no fun) the recommendations are spot on.
I managed to do six of the ten and I intend to see the rest the next time I go.
There is also an excellent fold out metro and bus route planner in the rear and detailed maps of the entire city amazingly all squeezed into this massively value for money, and yet still pocket-sized, guide.
Needless to say, It was very useful.