At 7am at a family holiday cottage in the school holidays.. I don't think there is anything wrong with that!
THIS ^
Babies cry - they teethe, they get over-tired, they feel off-colour, they just get arse-y sometimes and we don't know why.
7 am is NOT an unreasonable time - I agree that it's earlier than some people might want to be woken on their holidays, but if you book somewhere that says "children welcome" then you have to expect children's noise.
This is why I, a miserable ole trout who has done my time with kids, thank you very much, tend to prefer places where there are unlike to be children. But even so, I wouldn't consider a 7am "getty-up" unreasonable. You can always make a cuppa tea and go back to bed.
TBH, in a situation like this, where a small baby is involved, no-one can predict how much crying will be done - and even if it's all night, it may well be a PITA, but it just can't be helped.
YABU for expecting help.
YANBU for expecting a bit of tolerance and YANBU for leaving a review warning other parents.