To begin with Lenwells were professional and polite; the service in the Bedford branch was good. However, having lived in a Lenwell managed property for three years I can agree with the majority of tenant reviews here (notice the good reviews are from landlords...).
The house appeared to have been vacant for a while since the general state of the house was not good, the gardens were not well kept and had overgrown and the grass was a foot long. We had to update the inventory which claimed the house was spotless and the gardens were lush (maybe it was when it last had tenants in?). Couple this with the regular inspections they do for the benefit of the landlord and you have a recipe for stress with Lenwell! We have received letters complaining that we do not keep the gardens in "the good state they were in at the start of the tenancy" and that "the house is unclean and not in the state it was at the beginning of the tenancy". Whatever that means.
We have a gas fire in the front room which has a red notice on it saying "Danger do not use" on it, which we knew about when we moved in so that is fine. What is not acceptable is that the fire passed the first year of Lenwells gas safety inspection and failed the second year because it had been continually leaking gas.
The tenancy agreement states that the agency must deal with day to day repairs but again, this is not a guarantee from the tenants point of view. What happens is Lenwell ask the landlord before making any repairs so the landlord can opt out of any repairs or choose to idle until he has your next months rent safely in his pocket.
My advice; if you are a prospective tenant choose a different agency because Lenwell is a landlords agent only.
In summary, Lenwell will not clean the house before you move in but they will expect it to be maintained to a higher state than they can be bothered to.