Great value for money, clean and close enough to metro and other amenities, not to mention all the sight seeing. Very quiet area itself, very comfy bed, kitchen well equipped which we appreciated a lot as were preparing loads of snacks for daily trips (due to some very specific diet requirements).
The only thing I'd suggest would be to keep some sort of clothes air dryer to dry your clothes if you get wet and maybe an extra small heater - and I only thought about it as we got all soaked first night on arrival due to heavy rain in Lisbon - luckily used the hangers and let the clothes drain in the shower and then got them dry putting on the chairs next to the radiator ;)
We'd definitely recommend Isabel's place to anyone staying in Lisbon :) Thank you again!