We rented a house using Andrews as the agent, with Andrews collecting the rent and the deposit and the landlord carrying out any repairs. Be very wary of this arrangement as if there's a problem, then Andrews say contact the landlord, if the landlord then ignores the problems (which they did in our case) then you have no option other than citizens advice or the courts. In our case we had a faulty boiler from the start of the tenancy which took the landlord over 5 months to get fixed. We also had to suffer 6 monthly inspections from Andrews and then right at the end, were stung for a full cleaning charge even though their was only minor marking on entrance walls as would be expected after 18 months.
If you do go with them, then do not sign the inventory unless you are 100% happy that every fault has been highlighted and always take pictures. When we checked out, the Andrews inspector tried to claim that damp caused by water penetration through the kitchen walls was our fault. So be very clear, that they are not on your side and any little marks not captured on the original inventory will come back to haunt you. Having rented previously via other agents with no problems, this was a painful and stressful 18 months that I would really like to forget.