Where do most expats live in Lisbon and is rent affordable?

Short answer: Bairro Alto, Príncipe Real, Alvalade, Almada (south bank), and Cascais are common; rents have surged 30%+ since 2022.

Lisbon T1 (1-bed) averages €1,200-1,800/month in central areas, €800-1,100 in Almada or eastern suburbs. Porto and inland cities are 40-60% cheaper. See Life in Portugal for neighbourhood guides plus partner-vetted realtors via Partners.