I was there in summer of 2006, and prices were very reasonable then, especially things like the tram system / underground. As with any capital city, watch your change and your belongings. Prior to our visit I saw several warnings online about short-changing being routine, but have to say did not experience this, similarly agressive begging was being flagged up, but I didn't see any. I think the biggest tourist scam is young men being lured into nightclubs by hostesses and charged zillions for a beer.Other than that the peple seemed urbane and polite.