Nuno is a nice host, he would give you tips where to go in lisbon. He also responded quickly with my concerns.
Regarding with the place it was accessible with everything, you can walk from the apartment to the city maybe 10 to 15 mins. There is also a station close by the Santa Apolonia station in this station there is a super market called Pingo Doce where you can buy food.
At night you can hear people walking outside the street. If you want a calm place better to be aware of that. If you are more than 190 cm tall you might need to bend down a little in the first floor of the apartment.
Over all I would recommend the place.