Perfect location! Yes there are 4 flights of stairs, but this only means no noise at night :)
We loved our stay in Goncalo’s apartment, and would definitely go back! There were plenty of lovely bars and restaurants seconds from the apartment and it’s so central for getting around.
We were a couple so it suited us perfectly but it is small so I wouldn’t recommend more than 2 ppl. There’s also no air con so it could be very hot in summer.
Overall, perfect for a couples weekend in Lisbon :)