We had a really nice stay in Lisbon in Sabine’s flat. The flat is really cute and cozy and well located. There is a terrasse as well.
We went during August and it was quite hot but the heat goes down during the night if you open the windows. Juste beware If you are very sensitive to city center noise at night and old town smells, but is is very manageable as you get a super flat in the center :)