The property is along the southwest edge of the Spanish Quarter, up the hill from the lively Via Toledo. The property is in a wedge-shaped building above Pizzeria Nennella (which appears to be split into two small shops, in case you get confused).
The wifi is great. The heater is almost too strong. The bedroom is in an upstairs loft, and the heat collects there. Even the lowest heater setting was too hot for me, so I simply had the pilot light on.
Among the quirks of the apartment:
-- The front door is quite narrow.
-- The light switches, such as in the bathroom, can be quite finicky.
-- The bathroom ventilation is not good, so leave the window open a crack after a shower.
Overall though, for the location and price, I was satisfied.
A minor complaint: It wasn't clear that I needed to pay in cash. I don't like to carry a lot of cash while travelling. Fortunately the owners were understanding and came back the next day after I found an ATM. From the booking, I see only the generic hotels.com statement that most places accept electronic payments.
General tip: If travelling from the Toledo Metro station, don't follow Google's directions; there are a lot of ups & downs and some stairs. Instead, go nearly to the end of Via Toledo, and go up Via Sergente Maggiore, for example.