My sister and i spent 4 nights in the apartment. Everything was just like on the pictures and the communication with Liliana and Bruno was nice and easy. Liliana welcomed us on the stairs on the way to the apartment (don't pack too much, you have to carry your suitcase up those stairs:).
We felt safe and comfortable in the apartment. It's big enough for 2-3 People. The neighbourhood is not too busy. It was always quiet after midnight. There are mini markets, fado restaurants and souvenir shops around the corner.
We loved to walk the tiny streets in Alfama. You can stop a Tuk Tuk or hop on a Tram to get downtown.
And the Subway is just a 5 min walk away (it's the last station of the blue line). You can also take a bus from there.
All in all this apartment was the perfect choice for us and we can recommend it to everyone who wants to feel like they actually live in Lisbon :)