We were 3,5 couples staying in Laura's apartment for an extended weekend, and it was great for this purpose. Location was central for all things we wanted to see - but as it always is with Lisbon you have to expect both a lot of uphill and downhill walking. The restaurant Solar dos Presuntos is only a short walk (10-15 minutes) from the apartment, and is absolutely worth a visit, especially if you're into seafood. Remember to make a reservation, because they are almost always full.