From what I have heard Portos is a better hotel than the other two in this series: Atos and Aramis, which both have 1 star. The bed was comfortable, bathroom big and clean, a small TV. No fridge. Did not eat there, but the menu looked good.
All 3 hotels are old apartment buildings from the communist-era and look awful, but its much much better on the inside. If you are going to just sleep in the hotel, than Portos is more than good enough. Too far from city center for people with kids, shopaholics and because of the esthetics, not for couples on romantic trips.