Well, my initial impression was that I got tricked by both the place and the location.
The place is very nice, very clean, it looks just like in the photos. The kitchen is well equipped, you have coffee maker, tea maker, sandwich maker, wine opener, lots of cutlery, and the cooker of course. You also have a washing machine which works just fine.
The place is really small though. Small but it proved cosy. The bed is really nice, new mattress, btw I think everything's new and from ikea.
The location is also VERY central, the street looks a bit shady to the untrained eye, but once you know the area, you'll see that everybody's minding their own business and that it's really safe to walk at any hour. There are lots of small restaurants on the street, check them out.
Personally I'd recommend coming to the apartment from Rossio instead of Martim Moniz, to me it seems nicer and shorter.
The host was extremely friendly and did her best to make sure that I'm fine. So, my initial impression was wrong, the place is really nice.