I stayed at Nuno's for a month and I absolutely loved it. Martim Moniz is an area where there is so much going on from a local perspective which you can get involved in. The street that the apartment is on has amazing restaurants, a local fish shop, and more. Plus there are some incredible sushi places here and a local Chinese supermarket that is amazing.
The apartment is so cute, it's sparkling clean, fresh and new and if it had an oven, I would have stayed there longer! There is no washing machine but a laundrette about 8 minutes walk away.
The only downside is that there is building work next door going on (February 2020) and so you wouldn't be able to sleep past 8am during the weekdays. Please note, that everywhere in Lisbon has building work going on so it's not unusual at all. The builders were always stopped by 5.30pm. This is something that I felt I should mention as it is loud during the day. And one other thing, I'd recommend ear plugs if you're a light sleeper, as in the evenings it's a little loud occasionally.
Overall I loved it here. As a single, female digital nomad, I loved the area, the people and the place. :0)