I was located on the second floor at the Serene Premier Hotel. The room was good size for Hanoi standards, the bed comfortable, shower was also good, and there were slippers provided. The free breakfast was welcomed, having a couple of options to choose from, the service was thoughtful.
The downside was I found the hotel to be noisy from the loud guests stumbling in around 1AM, talking at full volume that resonates up the stairwell and as well as couples arguing or fooling around in their room at 2AM as if they were at home. I chose this hotel as I thought a side street (alley) would be quieter than a main street, however at 6AM the locals have a market across the narrow side street that would have woman chopping meat. This was unfortunately the noisiest hotels I have been in during my stay in Vietnam.
I made an effort to speak with the front desk about this, but all they did was apologize for their loud guests, my expectations were that guests should be reminded to be quiet when entering late night as sound travels.