My boyfriend and I really enjoyed our stay in this modern apartment in Estoril. It has the perfect size for a couple and the outdoor area is a nice bonus. The bed was big and comfortable, the kitchen has most appliances you'd need to prep some meals at home and the bathroom has an amazing shower and is overall modern and clean.
From the apartment you can easily reach the nearby train stations and public beaches on foot. Cascais is also in walking distance, ubers are generally cheap (can also recommend from and to the airport as it is really quick). There is also a bus stop nearby where you can catch a bus to Sintra.
Even though we arrived earlier than expected, the check-in was lovely and Cassie made her way to the apartment as soon as she could. Whenever we had a question we could contact somebody and received quick replies. Overall we are very happy with this place we stayed at and can truly recommend it.