We had a great one-week stay in Lisbon! The flat is perfectly located in a very dynamic neighborhood. It is near all basic necessities and most attractions of Lisbon are reachable on foot. Furthermore, it is not far from the Rossio railway station where there are regular trains to Sintra.
However, we were disappointed that dishes and utensils were all dirty when we arrived there. Also, we saw two cockroaches in the apartment the first night (Margarida solved the problem once we told her).