I've been to Portimio so I knew where the flat was. If you are looking for a base to stay this is it. Its situated of one of the main roads so its great if you have a car but everything is a short walk distance away. Since we didn't have a car it was great for us.
Just across the road is a big supermarket and there is a lidl and macdonalds near by too. The beach is 20 min walk and the train station is 25 min walk.
The apartment was clean and a great view from the balcony but if you are afraid of heights, its maybe not for you. Emiel was so helpful and friendly and I would come back again. The Wi-Fi was working great. The bed was really comfy too.
The only thing I would suggest is to bring your own tea, coffee etc. Some basic condiments would be handy like salt , vinegar, oil etc because to buy them if you are staying a week or so is a bit of a pain. But I suppose you do eat out quite a bit because its so cheap.
All in all great place to stay and we hope to be back!!