Sympathies, sympathies Stickybean. I think I started a thread virtually identical to yours a couple of years back - and it hasn't got much better I'm afraid - although we are a little more judicious about what we agree to from the outset.
So would suggest firm boundaries right from the first moment the visit is suggested on the telephone.
at MrsSchadenfreude's cheeky 'friend' who had 'already booked flights'.
Always, always be ahead of the game in terms of what you want to be doing for long weekends or holidays, else other people will plan it for you. You need to be able to say without hesitation "oh it would have been lovely to see you but we are heading off to x then" or "oh what a shame but dh's god-daughter is staying with us over that weekend" (even if they aren't
)
We like in Brussels and like Londonmoo absolutely detest the tourist trail aspect of it all. Can just about do my job, look after house, make up rooms, do the extra shopping and provide meals but I know draw the line at shepherding people around the sites that I have seen fifty times before.
As others have said, it ultimately depends on how your guests behave though.
I have one set of regular guests (brother, his dp and their two dc) who always arrive , "exhausted", empty handed, never lift a finger to help, never pay for anything, expect to be chauffered everywhere and, worst of all, the moment they arrive; exonerate themselves from all responsibility of looking after their dc who I am expected to entertain at every waking hour. And they barely bother to say thank you afterwards either.
On the other hand, when my best friend visits from France (also two parents and two adults) they arrive under their own steam (never need collecting from anywhere), come laden with inexpensive but really thoughtful gifts (eg walnut oil they have pressed themselves, local cheeses etc) are up and off and out every day, insist on cooking a couple of evenings while they are here and even offer to take my dd out with them for the day. And I always receive a huge bunch of flowers and a card in the post three days after they have left.
Tis chalk and cheese frankly and I know which lot are always welcome and which lot ellicit groans...
Dh and I dream of winning the lottery and being able to convert our roof in to a self-contained flat which we could have made up for guests at all times, with it's own little kitchen etc which would put an end to the endless tea and coffee-making, can I borrow your iron scenario etc etc. Mind you, that might encourage more guests to come. Yes, thinking about it, might keep it as a wreck after all ....