We wanted to see Venice but also had to stick to a budget so we had heard that Treviso was a good option. It is north of Venice and a relatively short train trip (20-30 minutes).
The town of Treviso itself was quite delightful - similar in many ways to Venice, although not as grand of course, but with little canals, bridges and charming architecture. It is also a walled town and has a bike path around the perimeter. The hotel we stayed at - Hotel Ca' del Galletto - provided free bikes so it was good fun hopping on the bikes and riding (about 1 km) to the town boundary and then riding around the small town itself over the winding cobblestoned roads. It certainly saved the feet!
The hotel we found very comfortable. We had a 'comfort' room with much-needed airconditioning and reasonably spacious tiled bathroom. Breakfast was pleasant and the hotel had a pool. For 114 euros per night we found it very good value for money.
Of the four days we had for Venice, we spent two in Treviso as we found it so pleasant. Although Venice is absolutely stunning and unique, the heat and the crowds affected our enjoyment of it, so two days were all we could handle. June, July and August are certainly not months I would recommend anyone travel in Italy - way too hot and crowded. Spring and autumn are much better for travelling.

Treviso is a charming city but it suffers from the lack of a hotel which truly matches the charm of the town. Having visited the town many times over the last two years I have stayed in most of the 4 star hotes in town. OK cut to the chase, the Ca' del Galletto is not pretty, locate out of town and the rooms are in need of a revamp. There is a carpark and a resturant located next done [which is not too bad, but if possible head into town for something to eat]. It is located outside the walls of the town and is 15 minute walk to the centre. The test I always use for a hotel is would I return, and the answer is no, I will just have to continue my search for another hotel in Treviso.