My wife and I really enjoyed our stay at the Olissippo Palace Hotel. I strongly recommend it for a visit to Lisbon. The breakfast buffet in the morning is excellent. I am on a gluten-free diet and they were very accommodating. They brought a wonderful basket of two different breads and a fresh lemon poppyseed muffin. They will make any sort of breakfast coffee for you and custom omelets in addition to the buffet.
When touring gets tiring, taking a break for a day at the pool is great. They have pool-side food and drink services, a nice bar and some regular restaurant tables under umbrellas for folks who are not interested in swimming. If you require warm water for a swim like my wife, the indoor pool is kept a bit warmer.
We enjoyed visiting the bar by the lobby in the evening and listening to the piano player. They bring some nice snacks with the drinks. After dinner, we went back for digestifs. They brought some cookies rather than salty snacks. I mentioned that I was on a special diet and the waiter rushed to the restaurant for some gluten-free cookies.
The concierge arranged reservations for three different restaurants during our trip. All were very good and two of them were a short walk from the hotel.
After my visit, I left something in my room by mistake. I called the concierge, and he immediately tracked it down and arranged for it to be mailed to me on the other side of the world.
Again, I strongly recommend this hotel.