Martinx ,ive never punted at any easy hotels but think they are all very basic ,some with no windows or even a kettle and things like television are extra charge but for the purpose of a booking im sure it would be ok ,again dont know about keycards though.
If its an option could you not book a DayUse hotel ,example being Leonardo Hotel Sheffield is £55 from 9am till 5pm.
Good luck whatever you decide to do and hopefully some who have even stayed at easy hotel can offer advice.