I stayed at Paulo's flat for 4 days and it was really enjoyable. While the check in process initially seemed complex, with some patience it's not such a big deal. The flat is spacious and in a nice neighbourhood with a great Chinese and Indian restaurant right across. The rooms are large and so are the bathrooms. The living room is comfortable and there is loads of natural light. The city center and Chiado are a short walk away and you are right in the middle of all the Lisbon action. Overall, highly recommended.