The apartment was exactly as described, and exactly like the pictures. So light, very secure, and although it was at the top of many flights of stairs - the views were incredible!
The two stand out things were as follows
1. The location. We travelled by train from the airport to Santa Apolonia station, and it was ideally less than a 5 minute walk away. This meant we had a great base from which to get the train, or metro if we needed to, although actually many sights like the Castle or the Pantheon are within a 5 minute walk, and the centre of Lisbon only 15 minutes!
2. Antonio! What a perfect host, he could not have been more helpful. Always in contact leading up to our arrival, meeting us from the station, giving us restaurant tips, booking a taxi for us when we were leaving (at 5am!) etc.
Absolutely perfect.