Stayed here with a friend for 7 days in the end of July; and had a great time.
The staff are fantastic - very friendly and do a great job; from the bar staff to the bottom.
Bathroom was very clean with a good solid pressure shower; certainly a bonus. Free lobby internet was a friendly touch.
Cannot comment on breakfast, as it seemed expensive.
Osterport is great location-wise - you can walk to central in 15ish minutes. You're just around the corner from the statens musem for kunst. It is a seemingly quiet area of town, but there's a few good supermarkets / italian takeaways / bars and places of interest, quite nearby.
The big downer was of course, the rooms running flush next to the Osterport station. It's noisy. If you are a light sleeper then this will mean trouble.. so much so i'd recommend somewhere else. If you're not, then it's tolerable.. in fact you sort of get used to it
Interestingly, very hard to find a laundry from here. (the hotel service is terribly expensive).
But again, it is comfortable, very cheery staff, great location and hence, quite good value.