This was my first time using Air BNB and visiting Lisbon so I didn't know what to expect.
Ana was very friendly and helpful. The apartment was clean, the same as the pictures and near all you might need. The location is great, you have a pharmacy right next door, plenty of restaurants, little markets and public transportations.
If you are someone that doesn't like noise it would be better to rent the whole apartment since it's shared. I was woken up many times by the other guests, but since they weren't staying long my stay was pretty good. Also don't forget your adapter, I'm from Canada so I needed a specific one. No worries, there's a store a couple of minutes walking that sales international adapters.
I would very much recommend Ana as a host and the appartment.