You can't beat the location if you are visiting Lisbon and want to check out everything the city has to offer. It's right in the heart of the action and even though the building is very old, the apartment itself is modern and very clean. Also, the keyless entry makes going in and out extremely easy. We also loved having all the amenities as if it was our own home. Very comfortable for our family of 5.
The only warning I'd mention is that the elevator (lift) is not on the ground level. It's on the 1st floor (which in the U.S. would mean it's on the 1st floor), so it was slightly inconvenient for our stroller and large bags (which barely fit in the small lift anyway:)