We have a total monthly net income of about €3,600 (after deducting private health insurance, etc., and without Christmas bonus/vacation pay/bonus) and have targeted a monthly rate of approximately €900 - €930. This is manageable for us, and we will still be able to save reserves for repairs, new purchases, etc. We definitely did not want to go higher with the rate because we prefer not to budget too tightly and not to have to consider every restaurant visit whether we can really afford it, and also to have some room for a vacation.
In case we have children someday, it was important to us that a change in the repayment rate would generally be possible in the financing, because at the moment we can poorly estimate what the living costs will look like then, and at least temporarily one income may be (partially) lost. This way, in case of emergency, if it really gets financially tight, we can reduce the rate (and later increase it again).
Basically, I find your rate OK. Your income is similar to ours and the rate is only slightly higher. Of course, it depends on what kind of living costs you have (e.g., cars, etc.). The most important thing is that you feel comfortable with the rate. Have you kept a household budget for a few months to see if the rate is manageable for you?