The apartment needs a good refurbish otherwise everyone could put his/her own place on airbnb at whatever conditions!
I guess every place in Lisbon is old with small size, but if they turn then in tourist accommodations they should guarantee some decency.
Pros
Location is great
Cons
Bathroom is too small, you can barely enter and it gets difficult close the door. Shower as well is half broken and rusty.
The apartment is a bit noisy: the noise from the street can be handled by closing the windows, the main problem was coming from the apartment above, you can hear every step and those tenants were very noisy with music til late in the night.
The sofa is broken too.
I would have also appreciate some info and reccomandatios from a local on check in, not just a show around of the house