He might be ideal in the booking, but outside bookings is stepping out of line = to me not an ideal client and I'd want to tell him this. Ie you like him but you can't tolerate the phone call behaviour, if he wants to continue he is more than welcome but if he doesn't stop the calls you'll have to stop seeing him.

I would say stop answering his calls and at the end of the day text him like "sorry I was quite busy today, call me next time you want to make a booking, take care"
He ll slow down this way...

I would just not respond until last thing at night and say "sorry had such a busy day. Off to sleep now but looking forward to catching up when I next see you".
If he continues to text then just ignore them unless it's specifically regarding making a booking.
He'll soon take the hint. If he asks you face to face why you haven't been responding as much then tell him you've been busy with friends & family recently and can't be texting clients when with them as it's not very discreet. If he's a decent person he'll understand that he's crossing boundaries and will stop

If you add the time to answer the calls etc onto the time you spend with him it will take your hourly rate down drastically.  He is what I class as a Clingon ....that you can't get rid of ... And to be honest, that is what I would want to do.  He doesn't see you as just a prossie he makes a booking with. Look out!

I'm inclined to agree with Sammy S. I have on client who likes to talk with me too (although admittedly not QUITE as often) but I wouldn't want to lose the business.

He can be discouraged without you hurting his feelings if this is what you want. I mean, we could all be direct and tell clients whatever we wanted to but customer service sometimes means going above and beyond (although again, not several times a day).

Personally, I would ignore his calls until the evening and then text.