Isabel was an absolute sweetheart; she met me at the airport and guided me to her flat, which is roughly 10 minutes from the airport by foot (considering luggage is in hand). The walk is easy, straightforward and safe. The room itself is small but efficient, and you can use the bathroom and kitchen as you please. If you arrive at a decent hour, take a taxi (about 10 euros) to Alfama or a nearby neighborhood for bite/drinks, sightseeing and shopping. Thank you, Isabel, for helping me make the most of one night in Lisbon.