We had a two-night stay in mid-September. Lisbon was hot, but this top-floor apartment had double doors/windows that meant a lot of good air flow so the heat wasn’t too bad. Check in was easy—at a small store a block away. There is a lock at the street and another for the apartment—secure, especially with only three units in the building.
Good natural lighting, a nice bathroom with good water pressure and a nice kitchen with a full four-burner stove and oven. Wifi good, first aid kit and fire extinguisher handy (not that we needed them) and washing machine with drying rack in nice condition. Nice views on both sides, and still felt private. We left doors and windows open all night.
The bed mattress was fine, but not great. We tried the futon and it’s not very comfortable, but would work for a night or two if sleeping on your side.
There are a few markets, restaurants and panaderias in easy walking distance. Street car lines run a block away. The Metro (for the ride to the airport or main train stations) was about a 15-minutes walk with a rolling suitcase. We found it easy to walk to several major historic tourist sights, and the Timeout Market is a short walk.
The stairs up are steep and narrow; not recommended for kids or folks with mobility challenges.