Guy and Vera are very timely in their communication and information and the apartment is fine for two people. It is mostly as described but there are several parts of the apartment that could use maintenance or replacement. The kitchen cupboards and drawers don't all have handles or open properly. One set of electrical outlets in the kitchen was a power-bar inside a cupboard (?). The frame of the shower stall in the bathroom is held together by makeshift pieces that don't make it very visually appealing. But these are small issues that should not prevent you from renting the apartment.
The biggest issue we had, and the one that made us to leave after one night after originally booking for two nights, was the dampness and the automatically-dispensed, strongly-scented floral air freshener. Although the apartment has a dehumidifier, it smells damp and musty inside. I think to cover up this odour, the owners have installed an air-freshener in the apartment that automatically squirts every few minutes. My wife has asthma and is scent-sensitive. Because of this, we immediately disabled the air-freshener from automatically spraying while we were there. Unfortunately, between the mustiness and the strong floral scent of the air freshener that had gotten into the bedding and all the fabrics in the apartment, my wife had a miserable night's sleep. We chose to leave after one night than stay for the second night that we had booked. We told the owners after the first night. They were sympathetic but did no offer any solutions to the problem. They said that Sintra is a very humid city because of its elevation and nearness to the ocean so this is a problem with all apartments in Sintra. I am not sure if this is true or not as we did not stay in Sintra the next night. This is just a warning if dampness and scent-sensitivity are issues for you. We did not know this before booking this apartment and it cost us having to pay twice for one night of our vacation.