The hotel was very cheap so I'm not sure if it's too much to expect clean sheets. The sheets on the bed were very dirty including fresh stains and drops of mud (or poo?). When I showed the hotel staff they moved us into a different room and I requested clean sheets from the store room which they provided.
A couple of things to note are that this hotels is not particularly convenient to the airport tramline so what you save in hotel costs you pay for in taxi costs - you could stay somewhere slightly pricer/nicer and catch the train to the airport if price is of a concern. It looks as if they are going through a renovation so it may improve in the future. Also, the hotel seems to go under different names - OYO airport palace is on the exterior sign which is different to the brand that we booked through.