We enjoyed our stay in Lisbon greatly! It was wonderful to have a clean apartment to rest our tired feet at the end of the day (sometimes after walking 10+ miles).
With that being said this apartment will not be for everyone. It is at the top of a very tall hill and then up three flights of stairs.
Also, the neighborhood was less than desirable. We didn't feel overly welcome there as it was very much away from the main tourist area. Although this could also be seen as a positive for us it left something to be imagined. We didn't feel particularly comfortable in the area as it is quite shady at night with a crowd that I wouldn't have felt safe around without my boyfriend.
Martim Moniz, although a main metro station is in a not so nice area. A lot of garbage everywhere and the centro commercial do mouraria is sketchy to say the least.
I would urge future travelers to do their research about which neighborhoods to stay in and in the future if we were to return to Lisbon we would like to stay perhaps in Chiado/Baixa.