Hey Tahawar,
Well, I completely agree with Seb on what he said regarding the tour schedule. I travel to the tour from Israel, so it's always rather expensive and a hussle to organize. My best advise would be not to travel cross-country on the day of the show, unless it's a really must-see show. I've done back-to-back shows that were on different locations several times, and it was always tiring. When the shows are worth it - you don't care, but if the show is a bit on the slow side, it can really ruin your emtire experience. WIth three shows, the best way to go is as Seb said - pick three dates that are a few days apart. That way you can travel with ease to the location, not stress out about getting there on time. That way, you also have more budget friendly choises to choose from for example - sometimes the cheap inter-european flights will be cheaper on a specific date, and higher on another date, so if you have several days apart between concerts you can choose a cheaper flight.
As for greece - Bon Jovi have never played there before, so it might be "historic". However, like in every first concert in a country - Bon Jovi do a greatest hits show - meaning - everything you've already heard. It would still be nice to go - I think the crowd would be awesome, but considering the price of the flights and hotels that eason and the price of the ticket for that show - I would pass. I'm passing that and it's an hour flight away from my house
As for hotels: try booking.com for reservations - they have a vast variety of all class hotels, their site is rather easy to use, and best of all - they usually charge you no fee for the reservation, and you simply pay when you arrive at the hotel. Cancelation is also free mostly (but check the hotel discription, cause it sometimes varies). As for hotel quality - try tripadvisor.com. What I always do is find the hotel that fits my budget and location on booking.com and search for its reviews on trip advisor - that way I know that I'm not arriving into a hell hole

I do recommend booking hotels as soon as you can. Being summer, every location has to acommedate not only the ususal tourist boom, but also the dozens of thousands who arrive to the Bon Jovi concert. If you do that in advance, you'll have cheaper hotels to choose from.
That's all I can think of right now. Feel free to ask.