The Lisboa Metro was very easy to use. There are only four lines, but they disperse to all parts of the city. The stops are situated at very convenient locations, mostly squares of the various barrios. It was clean and felt relatively safe even late at night. The trains run until 1am. The only snafu I encountered was my ticket expired on my ride and I wasn't able to get out of the station. It's odd because there are no purchase kiosks on the inside of the gates. Luckily another rider helped me pass through. read more