It is a convenient place to stay not too far off the city center, which can be reached by a 15-20 minutes walk. Supermarket, small kiosks and a nice breakfast place are around the corner. The next metro station is a bit too far, but there is a bus station easy to reach.
The apartment is nothing too special (interior-wise), however everything you need for a stay is provided (incl. a fully-equipped kitchen and washing machine). The downside is the humidity and smell in the staircase and within the apartment, but this is common in old houses like this one in Lisbon's traditional residential areas.
Nice add-on: the small balcony to stand outside (no seating possible though). All in all, the price-value is ok.