Erina's apartment is beautifully decorated, extremely clean and in a very picturesque location! It's exactly as described and we really enjoyed staying here. It's a perfect little apartment for a couple or a solo traveller.
However, I wouldn't suggest this apartment for somebody with reduced mobility, as Alfama has steep, narrow roads that cars can't get through, so you have to carry your luggage for a while whilst getting to the apartment. Also, the bed is on a mezzanine against the ceiling, so not recommended for someone very tall/claustrophobic/unable to get up the stairs!
It is quite a small apartment, but everything has been fitted very well so you never feel like it's too cramped. The kitchen table and the hob are quite small though, so you won't be able to make massively extravagant feasts!
The apartment opens right into the street and can be a bit noisy, you can hear the locals talking and your neighbours upstairs walking. This didn't bother me at all, but I imagine it annoying some people. If you are a light sleeper or enjoy complete silence then maybe this neighbourhood isn't for you!
All in all lovely, and I would definitely stay here again.