By Clerigos studio was a great place to stay in Lisbon, our apartment had a fantastic balcony overlooking the Clerigos tower across the street! it was very clean and well furnished and we were met by Mario who was very welcoming and took the time to go through which sights to see and where the good restaurants were! we tried Caldeireiros just down the street which had really nice tapas and great service!
Also top tip for anyone who stays here, there is a shop around the corner called All In Porto
which rents electric bikes for around 15 euros, take one of them and go down the river to the sea and the lighthouse, great fun! :)