We had a great stay at Nuno's place. The apartment was bigger than expected, and centrally located in a historical neighbourhood, close to public transportation and a large supermaket. It also has great food options including the best pastel de nata I ate in Lisbon (Pastelaria Doce Mila). I'd advise some caution though when walking alone towards Pç Martin Moniz at night - it gets a bit sketchy in that area.
There can be some noise from the upstairs neighbours, but it wasn't too much of an issue for us. There's also no elevator, so it's not ideal for people with mobility issues . Overall, I felt we got a really good deal for this place, and Nuno was a great host. I'd stay there again.