We stayed at Nelson and Pauline's place from 7/13-16. We enjoyed the super clean house, the very convenient location and the great hospitality of Nelson and Pauline! They even had some food for breakfast ready for us!
The only thing that we did not enjoy was the noise from outside. The house faces a busy street (restaurants and bars near the house) and when the bars close at 2am, there is a lot of noise from inebriated people walking and driving home (horns, sirens, arguing, yelling). It disrupted our sleep each night.
I'd recommend Nelson and Pauline's place to anyone who visits Boston/Cambridge area but I would advise them to take a pair of earplugs with them unless they are very heavy sleepers or plan to stay out late.