We are having a great time so far despite incident yesterday morning. Please beware... We were trying to buy metro card ... Guy comes up and very gently offers suggestions how to do it. Then he asks what my husband is doing when he enters 99999 in zip code section. We have a UK card. He immediately says don't do that. Don't believe what you read on the internet. By this time feeling like something is up but two kids with us so just want him gone. He says he will pay on his card although husband has already put his card in. Bottom line we paid hiim $20. Surprise surprise my husband's payment had gone through. The station was empty so just wanted to pay him off. We immediately went to cancel our cards not knowing if he may have swiped our card somehow. We saw him standing around looking for other victims. Please be wary!