We spent four days in Lisbon sightseeing in April 2017, it was amazing! The weather helped, it was bright, sunny and warm. The highlight of our trip was a day out to Sintra. With the stunning Pena palace perched high on a hill with the town below full of charming cafe's and bars.
We stayed at the five star Hotel Real Palacio. The rooms were very comfortable, the staff were friendly and their was plenty of choice at breakfast. Lisbon is a sightseers dream, The architecture is fantastic the people are friendly and the food is great!
I would strongly recommend a 24hr bus pass, it's good value and you get to see everything.
Tips: Make sure you take your camera and a good pair of shoes because it's very hilly!