Overall the apartment is good - (the location is good and it's a relatively quiet neighborhood).
How good (or bad) depends on your perspective and length of stay. If you are in your 20's, and/or staying for just a couple of nights, this will probably be a great place to stay. If you're older (we are in our 50's), you might want to reconsider. For an extended stay, well... We stayed for 28 days and for us, the stay was just okay. We think we could have done better elsewhere.

First, there are four flights of stairs and it is steep - it's more akin to climbing a ladder than going up steps. And walking the hills of Lisbon all day doesn't make those steps easier.
The overall apartment is in good shape ( a few minor maintenance issues) but it is cozy and for the time we spent there, we did enjoy it and it served it's purpose.

The amenities are limited, you get one towel per person (extra will cost). There is limited bedding as well. There is a small washing machine but no dryer (even though the listing says there is) but there is a drying rack. Otherwise, it had most everything we needed.

As for our host "Benjamin" - he was very cordial and he did communicate well with us. Not sure if he's the owner or if it belongs to "Good Time Home" and he was our point of contact.