The Florecer Castitas are a great quiet spot near the panoramic highway, above Centro in Guanajuato. The walk downhill to the University is about 5-10 minutes -- be sure to bring real shoes with rubber soles as the hill is very steep and I needed ankle support on the cobblestone streets. To return from Centro, walk up the hill (there was no amount of money on earth that would make me do it, but my companion did), take a taxi for about 50 pesos or the bus for 6. We had a rental car that we were able to park in a spot convenient and safe out front of the apartments by making arrangements with Liz ahead of time. Driving in Guanajuato is an adventure and not for the timid. : )
Liz is extremely responsive and a gracious host. The apartments are gas heated, with gas stove and oven. We needed a bit of instruction and a little patience, however they worked; not sure if AC would be needed in the summer. The roof patio and indoor gardens are both very nice, with great views which were perfect for New Year's eve when we were there. Bringing paper maps of town are helpful since the underground tunnels lose GPS, however eventually you always get back on track.
I set my GPS to the Oxxo convenience store down the street (De Guadalupe 29, Calzada de Guadalupe, Guanajuato, Gto., Mexico) when we left Guadalajara for the drive since my GPS could not find the apartment. Once you get on de Guadalupe (the right side of the white University steps), just keep driving upwards and a short distance from the top of the hill you'll see the pink doors on the right.
Bed for two king sized was very comfortable, great shower, soap and hot water. The bedroom and bathroom could use a better solution (admittedly I can't think of one easily) to where to put your things as it is close quarters. I unpacked mine onto all the shelves and stored my suitcase in the closet while my companion used the luggage rack in front of the closet. If I could improve anything in the living room, I'd lose the big chair, many fewer lamps and small tables, add a large coffee table and more cushy couch or pillows, plus a larger table to eat on would be great (or perhaps the coffee table could double). The patio furniture and table are great for this and where we spent most of our time. The wifi works reasonably well and we had fun watching Netflix on our laptop since they have rights to programs you can't see in the US for viewing in Mexico.
As for phones, neither of us got Mexican sim cards. My phone did not work except for wifi/data and my companion's did -- we are both on ATT. This was lucky since we ended up needing emergency calling on his.
If you're a cheese lover, check out Products Remo -- the cheese factory outside San Miguel de Allende. All the italian cheese you could ever want at extremely reasonable prices -- be sure to print all the info from their website before you leave the states so you can find the spot when you are there. You can bring the cheese back to the US through customs, but if you declare the meat as legally required like I did, then they'll seize your proscutto despite it's vacuum packaging and your sobbing ; ( I was sorry to see that SMA was even more American than when I last visted over a decade ago (US franchieses everywhere) and every happier that we chose Guanajuato instead as it is still quaint and Mexican.