I used to be in a similar position with a once a month to every six weeks trip down to HQ in London. When I couldn’t stay with mates – which was my usual MO – I’d book a Travel Lodge or similar cheap hotel in North London, drive down from the Peak District and get the tube into town.
It wasn’t a beautiful experience. I did not experience a community of like-minded souls – well, apart from other slightly bored and pissed off commuters – but it had a bed and a bathroom and a lock on the door.
When I stayed with mates I’d occasionally take a cross bike down with me and commute in on that, but never bothered on the hotel front. It never really occurred to me to stay in central London.
I guess it depends on your expectations and how often you have to go down there. If you have friends in London, I’d make some gentle exploratory moves. A nice bottle of wine, food etc go down well and it’s a lot more pleasant than staying in some anonymous hotel. Plus you get to catch up with your mates. Depends on frequency of visit a little I guess and having some friends in the capital.