We stayed at Maria's apartment in Edinburgh for three nights. The apartment was super clean and tastefully decorated. While it is situated near the far end of the Royal Mile, it is within easy reach (10-15 minutes by bus) of the city's main attractions, and it is close to the Holyrood Palace and the awesome Arthur's Seat hike.
Unfortunately, we didn't get to meet Maria in person, but she nonetheless made sure that our stay was comfortable and that we had everything we needed. Also, the information booklet in the apartment was very helpful and contained good recommendations.
Both Maria and the concierge company that manages the apartment were super helpful and quick to respond to our questions.
We only have good things to say about our experience and we highly recommend Maria's apartment to other guests.