A spotlessly clean place in the heart of the city, this is definitely worth the money.
PROS: About a 20-minute walk away from just about everything, including every restaurant we wanted to attend in Lisbon.
It's also kitted out with an nice powerful air conditioner (a must, as we were in town during the sweltering heat of July), a washing machine to clean clothes (immensely practical and a money-saver), and a great shower for washing off the sweat of a long day climbing Lisbon's steep hills.
Most importantly, the windows and glass patio door are double glazed and seal tight when closed, which render the apartment almost totally silent. This is of immense important in this section of town, which is definitely a nighttime party area: People roam up and down the streets in a loud, rollicking mood, especially on weekends, and if you're a light sleeper the noise could be a real problem. In this loft, it was like none of that existed.
CONS: It's a top-floor walkup, and the stairs are perilously steep. This place is not for you if you have mobility issues.
As others have noted, the ceiling above the beds slants down steeply; I'm 6'1" and banged my head at least twice.
But these are mild negatives -- the experience was great. Plus they provide a mobile wifi device to keep your smartphone connected while roaming the city. Pretty swell stay. Thanks all!