I just stayed in Hugo's loft in Gaia for a month, while taking time to sightsee and doing some work.
I arrived at the loft at 11:30 PM on a Saturday night and Hugo was there to meet me. Hugo was extremely responsive in communicating with me via AirB&B messages.
The loft is in a fairly new apartment building. The loft is very well equipped and clean. Once a week Hugo had someone clean the loft at no additional cost and she did a great job.
The one negative was the location. although the loft is only about 2 miles from the river side area of Gaia, from where you can easily cross to Ribeira or get on the Metro, there was no good good options for walking there. Most days I ended up taking a 5-6 Euro ride to/from the loft.
This negative was compensated by having the Arribada Shopping Mall with its great 25+ food places just a 100 feet from the front door of the building.