The PortoBay Marques Hotel is a very nice hotel in Lisbon. I highly recommend staying here.
The staff is excellent, even providing avvery early check-in as one of our rooms was not being occupied the previous evening. The rooms are large - both the room with the Queen bed as well as the Junior Suite. The room was impeccable - very clean as well the bathroom. The breakfast at the hotel was wonderful. We also had dinner at the hotel one evening when we were exhausted after sightseeing all day long and the food was very good. The hotel is located in a very safe and quiet area of Lisbon, near very high end stores.
There are two markets about 4 blocks or so from the hotel, which one can purchase water and other items as needed. (By the way, the hotel provides a large bottle of purified/spring water daily to each room.) From the hotel, it is approximately a 20 minute walk to downtown Lisbon, but if you prefer not to walk, taxis and Ubers are readily available and they are very inexpensive (compared to US and UK prices).
Walking to Avenida de Libertad is very safe - as one is actually walking through a park-like area. The Rossio Train station is only a 15 minute walk from the hotel or a 5 minute taxi/uber ride. One can use this train station to go to Sintra, much better than driving and parking there. Overall, I rate this hotel a 10/10 - and I am a very experience world traveler for over 40 years on non-stop traveling.