Absolutely fantastic apartment in a great location. Great for 2 (or even 3) couples or a family. The owners are incredibly generous and Pete would be the first person I'd turn to if I was renting out my own apartment in Lisbon! The city was gorgeous - I can't think why we've waited so long to visit it.
We made a fleeting visit to Sintra on Sunday. One word of advice: trains to Sintra on Sunday run every hour (not every 20 minutes as on other days) and we experienced huge queues to buy tickets (during early October), so do leave yourself plenty of time.