Yeah I'd definitely keep firm control of that ivy around the guttering/windowsills/downpipes. If it gets behind the guttering/downpipes with what is at first a fine tendril, it will grow and thicken and can push the pipes away from the wall (and can fill the gutter, blocking it). I really don't like plants growing on houses - I pulled some ivy down last week and quite a lot of masonry paint came down with it, where the roots had actually grown under the paint .
We've also just moved into a house with a garden which was obviously originally well-planned but had been recently neglected (and a neglected pond too!) - it's turning into a really fun journey of discovery - hope you enoy your garden journey too!