Parking is free for Diamonds, unless it has changed in the past few weeks. There are a couple of newer members of staff who aren't aware, but normally someone is on reception to correct them.
Top floor has been refurbished for quite some time (years) and some of the rooms are starting to get a bit worn. They may look a lot more fresh than some of the lower floor rooms though.
The lobby and restaurant area refurbishment is recent and has been done pretty well though. The restaurant in particular is a much nicer space for breakfast.