I view a number of properties with whitegate when looking to rent. I found them very helpful and punctual. I was in a hurry to move into somewhere as soon as possible and they were very accommodating in this respect once I had decided on a property. It would have been extremely awkward for me had they been overly bureaucratic in this respect but they were not, and I really got the impression that they were trying to be flexible to suit my needs.
I don't give five stars because I had to pay 6 months in advance but based on my income this was likely to have been the case with all agencies.
I can definitely recommend them, very helpful and professional.