I have stayed at this hotel once before in a standard room which was very small so on this occasion decided to book an executive room. The latter was a good size and on first impressions I was very pleased with the room. However, I will not be returning due to the policy employed by the hotel regarding the air conditioning. Initially the air con worked fine (although it only went down to 19C which presumably is a cost saving measure employed by some hotels). However, later in the evening the air con suddenly switched from cooling mode to heating mode. Upon reporting this to reception, I was informed that the air con only works when the external temperature reaches a certain level. This is ridiculous; I don't care what the temperature is outside, I am sleeping inside, so it is the temparature inside the room where I am actually trying to sleep that is important. So, despite air con being listed as an amenity at this hotel, it was not available to me and I will therefore not stay at this hotel again. Whilst I accept the outside temperature was cool, as with so many hotels the room itself remained hot and so the availability of air con was important to me, so much so that I only ever book a hotel if air con is listed as available. Whilst speaking to reception, the best advice they could offer was to open a window. I don't know if this was meant as a joke or if they were meaning to be helpful, but given our room was right next to the dual carriageway which runs alongside one side of the hotel, this was not a solution as the noise from the traffic was horrendous (on the plus side, this showed that the sound proofing from the windows clearly worked well, just don't plan on leaving them open!). I have immediate family who live in Hamburg so had planned to use this hotel on a regular basis but due to this recent experience I will now have to find a different hotel that actually provides the services that they list as available. The rest of the hotel was fine; dinner was good although I found the breakfast very limited but appreciate that is just down to personal preference. Other than the air con issue, the executive room itself was pretty good. It was a good size given the location of the hotel in a large city, but the bed wasn't very comfortable as the mattress was too firm and the duvet too thick, but again I realise this is personal preference. There should however be more than one pillow per person in the room; we did get more from reception but if a budget hotel chain such as Premier Inn can provide additional pillows in the room, then I see no reason why this is not the case at this hotel.