Just one tale to add....
a few years back with 2 YO and 4 month old, we opted for a week at a "child-friendly" hotel in Cornwall so we could have a week off cooking etc and use the babysitting/listening service and spend our evenings in the bar/entertainment....
Sounds great but...
that was 6 years ago, and cost us around £700 for the week...
We got there to find the "family suite" was just around the corner from the rear fire exit, the latch on the room door was in reach of our 2 yo and we couldn't deadlock it so he would be out at the first opportunity.... and could get straight out onto the main road.
The family suite was also a nightmare for anybody with toddlers - the kettle for making tea etc was at toddler height, the internal doorways were a non std width that our travel gates wouldn't fit - basically I've never stayed anywhere so unsafe for a toddler...
THe babysitting was at best baby listening, with somebody checking the internal phone line (with the phone off the hook), and the kids club would only take 3 and above, so we had no choice but to keep the kids with us at all times...even when having dinner.
Now most people with kids appreciate that babies do sometimes cry.... but not the hotel owner... part way through the week we were asked to leave the restaurant cos my 4 month old was crying (not at her loudest I might add!) and it "might" disturb other guests - nobody had actually complained but....
Add to that the fact that 2 YO went on hunger strike mid week as he didn't like the hotel food....
Not surprising we've never tried a holiday like that again, and I certainly wouldn't recommend the hotel to anyone....
We generally go self catering for main holidays now both in the UK and abroad - especially since we bought a touring caravan, though we do take the kids to travel inns and the like for weekends occasionally - they work really well once you are past the bottles/sterilising stage - the one in Edinburgh we stayed at was more than happy have the kids in the bar at night, and to get the kids drinks of milk at the bar too.