This is the perfect location if you want to be within walking/hiking distance to Quinta da Regaleira, Pena Palace, Moorish Castle, etc. You can hike directly up behind the apartment for Pena Palace, or simply walk down the street to Quinta da Regaleira.
The apartment itself was very clean and exactly as described.
While I didn't use it, there was a coffee maker with pods available and basic necessities for cooking (oil, salt, pepper, garlic salt).
While this is a small place, for a one or two night stay where you're out and about it is totally fine for 1 or 2 people.
Only word of warning is if you're taller than 6 feet, you may be crouching a little bit at times. I hit my head a couple times on low door frames, but it in an odd way adds to the charm of the place.
I'd stay here again if I was returning to Sintra to see the palaces, as the location is so close and apartment was great.