Lisbon has a reasonable healthcare base: legal residents can obtain an SNS user number to use the public system, and private options are plentiful.
Perceived crime is low; at night take more care around nightlife areas and transport.
Lisbon is not flat, but it still works well without a car thanks to metro, Carris, urban CP lines, and the Navegante system. A single ticket is about EUR 1.90 and the monthly pass is EUR 30-40.
Best months: April-June and September-October
Toughest months: July-August if you dislike heat, tourism, and extra pressure on central areas.
Rainfall is concentrated mostly from October to February; June to August is much drier, with average precipitation of 14.1 mm, 2.6 mm, and 5.4 mm respectively.