I booked this hostel room for my boyfriend during his stay in Bangkok. To be honest, at the beginning I didn't expect much from a hostel but they have surpassed my expectations.The hostel is a family business so you can experience homely hospitalities from them. I was impressed by the way they contacted us and they were very patient with out very late check in.
The private room is very spacious and comfortable. The only downside I have is that they do not have an elevator. So if you planned to come with a big luggage it will be quite a struggle for you (or the staff who was kindly helped us carrying the suitcase to the 4th floor.) However they also provide nice local breakfast and wifi connection to every guest.
While they are might be slightly far from the train station but you can get there easily by a taxi from the train station. The area is pretty quiet so you can have a nice break from all the capital city craziness.