I moved to a city around 2 hours away. Now live with my partner, happily, in a city centre flat. It's great, I can walk to things and be independent. Have a great relationship with my family.
My parents live miles from the nearest shop. I don't drive. Their house is very run down, and the only working toilet is in their en-suite. It isn't a great place to visit unless my partner rents a car. So I avoid going home to visit other than once every 3 months or so for a weekend.
More recently I have been getting lots of comments from my mum and her parents that it would be nice to see me. I have mentioned that I will be back for a weekend next month, and they are always welcome to come and visit me. Whilst we don't have a spare bedroom, I have slept on the sofa before so people can visit as hotels are expensive here.
Fortunately my grandparents are in fairly good health, and travel a lot independently. One has recently been to Crete for three weeks and another has just done a tour of Scotland (self driven). They are in their early 80s. Money isn't an issue for them.
AIBU to think that it would be nice for grandparents to visit me in my adopted home city? A day trip is feasible, and would be about 4 hours round trip on the train. Otherwise, if booked in advance you can get a hotel for £200 or even £100 mid week.