We stayed at this machiya in December. It is a historic building, with all the charm and practical problems that one would expect of a historic building--wooden beauty, classic design, sliding screen doors, tatami rooms on the upside, and poor insulation, bathrooms only on the ground floor, and a very steep staircase on the downside. Of course, the advantages are well worth the disadvantages, so long as no one in your party has a mobility disability.
The machiya itself is gorgeous and well maintained. It has been modernized with two nice bathrooms (note that the AC/heat extends poorly to both). The beds are on the hard side, but comfortable. There is a flat screen TV and a computer to use, as well as wifi. Maid service comes daily. The machiya is smaller than we expected. The main living room is only 4 tatamis, and the side room is even smaller. It is perfectly good for a couple, but not much more.
The customer service was fantastic from reservation through the very last day of our stay. Their English is excellent--including at least one native speaker of English--a luxury in Japan!
The location is great, about a 10 minute walk to the historic Gion district and Shijo Dori, with many temples and shrines are within walking distance, and restaurants & a grocery store 5 minutes away.
We definitely would recommend this machiya. Even more strongly than the machiya itself, we recommend Machiya Residence Inn, which manages quite a few machiyas.