I recommend this room for a short stay in spring/autumn season.
The reason for this is the night traffic and street noise. The windows provide very good sound protection, but when you close the window, room is not ventilated. This might be problematic in summer. I stayed in the room in September and it was ok. September is also perfect month to visit Lisbon.
Future guest have to take into the account, that Hugo’s place is located at the top of a local hill. From the level of the Rossio Sqare you have to walk up hill approximately 3-4 floors (approx. 20-25 m) to reach the entrance doors. Therefore I advise to use the public elevator called “Elevador Castelo”. The elevator is accessible from the parallel street R. dos Fanqueiros. This is very helpful especially when you arrive with the luggage. Public elevator is free and works form 8 AM – 9 PM.
Flat is very clean and spacious. The view from the kitchen is spectacular, with the Elevador de Santa Justa in the center. I used the kitchen for breakfasts and twice for a dinner, and was given a shelf in the fridge to store my food. The best laundry option is to use the public laundry located just 20 m to the left from the entrance doors (it also provides the dryers).
Considering the price of the regular hotel in Lisbon, Hugo’s offer is very good value for money. You can always go to the hostel, but you would not get the privacy.
Hugo also provides a guide, with some restaurant recommendations, which is very helpful.
Very good choice and very nice stay.