My stay at the HG Suites was mid week through the weekend. I had a room on the seventh floor, so this may be why all the other reviews about noise are lost on me - I didn't hear much noise from the street (only a little from 06h to 06h30 on Sunday morning from the pizza joint across the road on the side street) and certainly nothing from the metro. From what I could tell from the floor map, most rooms are on the side street, not Via Augusta, so I don't see why noise should be an issue.

The bed was very firm and blissfully comfortable, though the pillows were too soft for my liking.
The rainforest shower was amazing.
Housekeeping was thorough and remembered everything. They did, however, annoy me when they kept turning the air con off so I'd come back to a humid and stuffy room. I believe a guests preference for the entire night they paid for should override housekeeping's comfort for the 20 mins they're in there.
The room was sold to me with no mention of breakfast being included, yet croissants, juice and coffee every morning for free was a pleasant perk.
Snacks are available from a 'vending machine' - drinks just sit on a shelf, they're not refrigerated as there's no door, so warm water and warm coke are the drink options.

The only problems for me were the painfully slow elevator and the fact that my door key seemed to reset every evening so I had to keep returning to the reception to have it recoded. These are obviously not huge problems.

I'd recommend this place.