We really enjoyed our stay at the Santa Catarina FLH Suites. The staff were all really friendly and helpful, and will carry your luggage for you. The building does not have a lift (which you are informed about when booking) so having their assistance was really good.
The breakfast is also a lovely touch, delivered to your room at a time of your choice between 0800 and 1030, and you can choose so many options that are all well presented. I loved the granola with the natural yoghurt as well as the fresh fruit juices.
Each floor has a Nespresso Pro coffee machine so you don't have far to get a coffee as you need, and there's lots of crockery and coffee pods, regularly topped up. There is also cake served at 5pm which is a nice welcome surprise, and always well baked (the marble cake in particular).
The room we had on the top floor (prime suite) was very comfortable, it is up the most stairs so do be prepared for this. The bathroom was well maintained with a good working shower and toilet, and bathroom toiletries too in case you forgot to bring any. The large bed was really comfortable and having the chaise longue and soft bench at the end of the bed to relax in was a welcome addition.
We will definitely be coming back here if we stay in Porto - the little touches and the wonderful staff really do make you feel welcomed.