Hi Gina, you have chosen wisely for a short trip. Are you flying in from US/Canada, elsewhere in Europe, or somewhere else? I myself think the best months are April, May and October. June, July, August and even September are the hottest and most crowded with travelers. The winter months, Nov thru March can be good, but you can also run into more bad weather. As for flying, the ideal would be to fly into Venice and out of Florence, or vice versa, so you don't spend time or money backtracking for your departure flight, but the area you have identified is pretty compact, so flying in and out of either Venice or Florence would probably be OK too, or even in and out of Milano if that is a lot cheaper. Just realize that if you schedule a morning departure flight, you will likely need to spend your last night in the same city as that airport. Florence and Siena certainly cannot be adequately visited in the same day. For most people, Florence merits at least two days given its beauty and many wonderful sites and museums, and Siena is an hour away and also merits at least a full day. Many people stay in Florence and make Siena a day trip, while others spend one or two nights or more in Siena. If you have seven nights, one idea would be to fly into Venice for three nights and then go to Florence for four nights, and day trip to Siena, although that might make it difficult to build in horseback riding. With more nights, you might do three nights in Venice, three nights in Florence and two nights in Siena, or something like that. You could also do one or more day trips to visit other Tuscan towns, wineries, etc. either on your own or by tour. I don't know if you are traveling alone or with family or friends, but another option would be to spend some nights at an "agriturismo" in Tuscany, which is a farm which also offers lodging, usually B & B style. Some are very lovely, with pools, restaurants, and maybe horses. Most people rent cars when they stay at agriturismos, but not always. Other people here on the forum may have different ideas for you, and would certainly know more than I do about agriturismos and horseback riding in that area. For hotel recommendations, we would need to have some idea of what type of lodging you are looking for, how many people are traveling, and your budget. In those cities, you can go from very budget-priced to very elegant and expensive. You could also benefit from a good Italy guidebook if you don't already have one. The Rick Steves 2016 Italy book will give you lot of detailed information about sites, transportation, various types of hotels, etc. Happy trip planning!