We had a wonderful stay at Tomas & Ines place.
Indeed, the flat was really clean and well furnished (it has everything you need to cook etc.). Moreover the flat is even bigger than what you can realise on the pictures, which is great for up to 4 people.
The location of the flat is right next to Avenida da Liberdade, 5 min walking from the Avenida metro station, and you can easily reach the city center walking in around 10min.
It was easy to exchange with Ines and Tomas by mail or message, they were really responsive and helpfull, and the flat was full of little attentions (maps, tips, suggestions of activities to do)!
All in all, we would definitely recommend this flat to friends if they want to visit Lisbon in really good conditions!
Thank you for all!