For our first Airbnb experience, we are fully satisfied.
Ana Maria & Miguel are very attentive and responsive. Whatever coud be your needs or questions, they are concerned to send you the information quite in real time. (sms connected)
As for their apartment, it's so cosy and fashionable that it seems to have emerged from a review of interior design.
Although not directly located in the historical center (only 3 bus stops), you can find near arround a lot of quality shops and restaurants.
Conclusion: Accommodation highly recommended.