Diana's apartment is a wonderful place to stay in, especially for the first timers in Lisbon. The apartment itself is charming and very functional, fully equipped, a lot of light, perfect internet, etc. It is also very clean. The location is brilliant - on the most adorable street in Lisbon with many restaurants on the street and it is super central, with also easy access to train station to go outside Lisbon.
Importantly, Jorge and Diana are one of the most accommodating hosts, Jorge gave me a very warm welcome, with a lot of recommendations on where to eat, where to go and how.
I would highly recommend this place to stay in Lisbon - myself, I would return without hesitation.