Great location, in Alfama which is full of winding cobbled streets. There's lots to see nearby and the apartment is only a 10 minute walk from the nearest Metro station too. It's in a really quiet area so great if you're a family or prefer quiet locations at night.
The place was really clean and everything is as described. Gonçalo is a wonderful, friendly host. He gave same great tips on places to visit and dine in which were really helpful. I'd recommend staying here if visiting Lisbon.