A few years ago we had builders and decorators working on the house for seven months, mostly on the ground floor but also the bathroom at one point, and even in the loft. It was sometimes hard to find anywhere that was 'work free' and fortunately there are nice public toilets a few hundred yards away in the village. Because they were with us for so long we got to know them and chatted to them and worked around them, though I never interrupted the electrician if he was wiring something! We began by supplying a 'watering station' with tea, coffee and soft drinks but after a while some of them brought their own preferred beverages, and they all brought their own mugs - company rule to avoid breaking customers china! As they were with us through a lovely warm summer we could also escape to the garden, and DH to beloved his shed. The roof was tiled during a couple of very hot days and it was most pleasant sitting in the garden watching a well-built roofer stripped to the waist!! We of course took the precaution of putting fragile items, valuables and private documents safely out of sight, and not revealing any info regarding finances etc. in casual conversation.
If we have workmen here for just a few hours or a couple of days we just sit/hover in an adjacent area, put the tv on perhaps, or do some ironing, so that they can talk to us if they want/need to, and just leave them to get on with the job. I always offer a cup of tea.
If you already know the person working for you, personal safety & security is probably not an issue, but if it's someone unknown to you always ensure you can easily exit your house to get help if you should need it.