My wife and I spent at Appiani36 2 nights and it was a very good choice.
We came to Treviso airport from London at about 22.00 when the only way to get to Treviso city was to hire the taxi. It costed us EUR 14 to the Appiani36 (center of town) but you may pay even twice less if you share the taxi with somebody else.
Actually it is only 7 minutes drive from the airport.
We took 1 room at Appiani36 and it was spacy and clean. Breafast was nice and Federico's (owner of the B&B) advises were highly useful.
Treviso train station is about 20 minutes walk from Appiani36 but better not to rush to Venice - I recommend you to spend at least 2 hours to discover Treviso.
Train takes you to Venice just for 20 minutes (return ticket costs EUR 4.50) and you may return back even in midnight without risk to be late to the last train.

General impression: Excellent place to stay

It is really close to Treviso Venice airport and to railway station to go to Venice or Padua as they say in their site.
The bus n 6 is direct to/from Airport railway and during driving stops close to appiani36...it is really a good choice for moving around and rest after a flight, before starting to go everywhere in the region! They serve great coffees!

Fredrico and his wife run a fantastic B&B. As soon as we were in the door he had a nice map of things to see and where to eat in Treviso. He spent a good half an hour explaining the best foods to eat and drink and we had more information than we could get from a book! The rooms were clean and comfortable. He was very prompt on breakfast and like someone else said he made the BEST cappuchinos during our whole trip. If you plan on visiting Venice fly into Treviso and take a chance on this place, we really liked it.

they gave lots of information...whre to go, where to eat, what to see, and they prepare excellent capuccinos!