A wonderful place and an excellent choice!
The apt we stayed in is one of (I believe) three sharing a beautiful garden. Ours was the smallest of the 3, I think, but it was cosy in the best sense of the word, finely appointed, welcoming and convenient — perfect for us, a couple with 2 young kids. The building is an experience in itself, a real part of medieval Rhodes, a building with a history, with the characteristic stone walls of the Old Town. The garden was a pleasure to relax in at night, and it must be even more of a haven, both from the heat and the crowds, if you go to Rhodes in the high season (which we chose to avoid).

The location is top notch too: close to Sokratous, the main drag, so it's easy to go anywhere else in the Old Town with a short walk; but not so close that you are overwhelmed by the crowds and the touristy shops — in fact, the house itself is on a super quiet, traditional alley, and you can choose to skip the larger streets altogether if you want to explore the less touristy alleys of the old town (which is a bit like Venice, in that it is indeed full of package tourists and tacky bars, but also of uncrowded, pristine corners if you look for them).

Marta is the ideal host, friendly and savvy; she was extremely helpful and easygoing. When we come back to Rhodes, which we'd definitely love to do soon, no doubt we'll try and stay here again!

(BTW: for restaurants/tavernas in the Old Town, try Kostas, Dafni, Pizanias/Seastar, Ta Mezeklikia — all different kinds of establishments, but all excellent — or anywhere else that Marta will recommend).