Absolutely worth it! We had a fantastic time in this apartment during our 4-night-stay in Lisbon.
The apartment is located pretty close to the Metro station "Rossio" and Praça Dom Pedro IV. Therefore it is an excellent start for any kind of sightseeing anywhere in the city. Restaurants, supermarkets and a lot of sights are in walking distance and actually even closer than I imagined. Before booking this apartment I read a few comments (especially on Booking.com) of people saying they felt very unsafe in the area next to the apartment and of course this created some kind of expectation. But after staying there for 4 nights and coming back after sunset 3 times I have to disagree with them - I did not feel not safe at any time.
We have been welcomed very friendly by Roberto, who helped us with our luggage (as mentioned in several reviews the staircase is very steep!) and made sure everything was as we wished. The apartment is absolutely beautiful and the view across the city is breathtaking. The kitchen and living room area is very bright due to two smaller windows and a floor-to-ceiling window which makes you feel as if sitting on a balcony. The kitchen is fully equipped and we found everything we needed. The bedroom can be closed by a glass door. We slept absolutely amazing! The bed is extremely comfortable and it was completely quiet during the night. The bathroom is also equipped with everything you could need. All in all we really enjoyed our stay and loved coming back to this apartment after a long day of sightseeing. Would definitely recommend staying here!