We were living and working at Sylvia's apartment for one month and we had mixed impressions.
On the one hand, Andre and Sylvia are very friendly, nice hosts. We arrived late in the evening and Andre met us, also cookies, croissants and a bottle of wine were waiting for us in the flat. It was really nice! Hosts also gave us useful advice about the surroundings.
The flat was cozy, with a wonderful two level balcony and in the evenings we sometimes sat there and looked at the stars and lights of ships floating past. It was magnificent and romantic. A train station is about 10 minutes away and approximately as long is needed to reach the supermarket. Also there is a huge sports park with a calisthenics playground quite close to the flat and we went to train there.
Unfortunately the huge problem that spoils everything is the construction site outside the bedroom windows. They make really a lot of noise throughout the work day (every work day!) so you must batten down windows in order to save yourself from that. As a result half of the flat becomes a dark cave and maybe it is probably not what you expect from staying in sunny Portugal. There were also several little problems like lack of a coffee maker and blender (which were stated in the description).
So I can not recommend this flat to people who plan to work from home. But I suspect it is a good variant if you plan to spend only evenings and weekends in the flat.