Hi PD
A good accountant will get you do the work can do yourself. This allows you to control the business better. I would not let or pay an accountant to do this type of work.
To me, €900 a year seems very little for quarterly accounts and general hand holding. But I am an accountant, so maybe I am biased.
€500 seems ridiculously low for an accounting and bookkeeping service. But it could be that they are using bookkeepers and your partner is using a qualified accountant. If so, your partner will probably get a better overall financial management and accounting and tax service.
Brendan