I spend 2 long weekends at Sheraton Cascais in February and March. Close to Lisbon, 30 minutes walking to the sea, a lot of space to wander around without leaving the resort. Had a great lockdown offer that made our stays affordable.
One weekend was to celebrate my husband's birthday. They handled the cake, which was perfect. Had a garden access suite, a bit dated, but more than adequate.
In March I took 2 suites, garden access, and spent the last night at their penthouse, a very large 2 bedroom apartment with an amazing terrace with jacuzzi. Same decor, impressive size, jacuzzi a very special and warm extra.
Lacks an indoor pool, but these were at the time forbidden. Room service was good, and also enjoyed the fact they had apartments with kitchens and a proper dining table. Quinta da Marinha is a beautiful location, and very close to Cascais center. Room service and food in general was quite acceptable. Breakfast in particular was a great treat. Service is up to standard. Rooms are undergoing renovation, that I did feel was needed, not so much because the condition is not acceptable, but because the old decor felt a bit heavy/ did not age well.
Given the lack of an indoor pool I don't know if I would return during winter time without covid-19 restrictions. The exterior pool is very appealing and I would definitely return for a third stay during warmer months.
This is a very quiet location that allows you to breath fresh air while being close to the Capital and Cascais.