We stayed 5 days at Claudia's, and had a great time! It is basic, but clean, which was all wee needed.
Beds - beds were comfortable, and the linens were clean.
Kitchen - has a microwave, a stove, an oven, pots and pans, plates and silverware. However, we couldn't find any condiments or basic seasonings. It worked out well for us because we really didn't cook at all, but if you wish to cook, plan on bringing even the most basic ingredients, such as salt and sugar.
Bathroom - it was very clean and had hot water. The water from the shower leaked out onto the main bathroom floor just a bit, but wasn't a huge issue.
Location - it's well located in a residential neighborhood. Has a corner store on the same block, and a Walmart-like store within a couple of blocks. It felt safe, and is close (a ~15 minute walk) to the trendy Palermo area. It is also only 2 or 3 blocks away from Cordoba, where all the bus stops are. As for Subte, it's sort of in between 2 stops, so you do have to walk about 10-15 minutes to get to one.
Claudia - she's super super helpful! She helped us arrange a taxi from the airport even when we emailed her about it just the night before, and also helped us change money.
Miscellaneous - there is a pretty big closet, which could be helpful if you're staying long term. There is also a small safe in the closet, which we liked.

Overall, I'm happy I stayed at Claudia's!